diff --git a/graphql/account.test.ts b/graphql/account.test.ts
index 8e5a47f7..2c9dc8ef 100644
--- a/graphql/account.test.ts
+++ b/graphql/account.test.ts
@@ -1676,6 +1676,31 @@ test("addAccountMigrationAlias returns typed errors", async () => {
       "NotAuthorizedError",
     );
 
+    // A well-formed but nonexistent account id is also rejected with
+    // NotAuthorizedError, so the error does not leak whether the id exists.
+    const missing = await execute({
+      schema,
+      document: addAccountMigrationAliasMutation,
+      variableValues: {
+        input: {
+          accountId: encodeGlobalID(
+            "Account",
+            "00000000-0000-4000-8000-000000000000",
+          ),
+          actor: "@old@remote.example",
+        },
+      },
+      contextValue: makeUserContext(tx, owner.account),
+      onError: "NO_PROPAGATE",
+    });
+    assert.equal(missing.errors, undefined);
+    assert.equal(
+      (toPlainJson(missing.data) as {
+        addAccountMigrationAlias?: { __typename?: string };
+      }).addAccountMigrationAlias?.__typename,
+      "NotAuthorizedError",
+    );
+
     const invalid = await execute({
       schema,
       document: addAccountMigrationAliasMutation,
@@ -1778,6 +1803,159 @@ test("removeAccountMigrationAlias removes one alias idempotently", async () => {
   });
 });
 
+test("account migration aliases are manageable by organization admins", async () => {
+  await withRollback(async (tx) => {
+    const admin = await insertAccountWithActor(tx, {
+      username: "orgmigadmin",
+      name: "Org Migration Admin",
+      email: "orgmigadmin@example.com",
+    });
+    const member = await insertAccountWithActor(tx, {
+      username: "orgmigmember",
+      name: "Org Migration Member",
+      email: "orgmigmember@example.com",
+    });
+    const outsider = await insertAccountWithActor(tx, {
+      username: "orgmigoutsider",
+      name: "Org Migration Outsider",
+      email: "orgmigoutsider@example.com",
+    });
+    const organization = await insertAccountWithActor(tx, {
+      username: "orgmigration",
+      name: "Org Migration",
+      email: "orgmigration@example.com",
+      kind: "organization",
+      type: "Organization",
+    });
+    await tx.insert(organizationMembershipTable).values([
+      {
+        organizationAccountId: organization.account.id,
+        memberAccountId: admin.account.id,
+        role: "admin",
+        invitedById: admin.account.id,
+        accepted: new Date("2026-04-15T00:00:00.000Z"),
+      },
+      {
+        organizationAccountId: organization.account.id,
+        memberAccountId: member.account.id,
+        role: "member",
+        invitedById: admin.account.id,
+        accepted: new Date("2026-04-15T00:00:00.000Z"),
+      },
+    ]);
+    await insertRemoteActor(tx, {
+      username: "orgoldalias",
+      name: "Org Old Alias",
+      host: "old.example",
+      iri: "https://old.example/users/orgoldalias",
+      url: "https://old.example/@orgoldalias",
+    });
+
+    const fedCtx = createFedCtx(tx);
+    fedCtx.getActor = (identifier: string) =>
+      Promise.resolve(
+        new vocab.Organization({ id: fedCtx.getActorUri(identifier) }),
+      );
+    const sentActivities: unknown[][] = [];
+    fedCtx.sendActivity = ((...args: unknown[]) => {
+      sentActivities.push(args);
+      return Promise.resolve(undefined);
+    }) as typeof fedCtx.sendActivity;
+
+    // An accepted admin can add an alias to the organization account.
+    const added = await execute({
+      schema,
+      document: addAccountMigrationAliasMutation,
+      variableValues: {
+        input: {
+          accountId: encodeGlobalID("Account", organization.account.id),
+          actor: "@orgoldalias@old.example",
+        },
+      },
+      contextValue: makeUserContext(tx, admin.account, { fedCtx }),
+      onError: "NO_PROPAGATE",
+    });
+    assert.equal(added.errors, undefined);
+    assert.deepEqual(toPlainJson(added.data), {
+      addAccountMigrationAlias: {
+        __typename: "AddAccountMigrationAliasPayload",
+        account: {
+          actor: {
+            aliases: ["https://old.example/users/orgoldalias"],
+          },
+        },
+      },
+    });
+
+    // ... and remove it again.
+    const removed = await execute({
+      schema,
+      document: removeAccountMigrationAliasMutation,
+      variableValues: {
+        input: {
+          accountId: encodeGlobalID("Account", organization.account.id),
+          alias: "https://old.example/users/orgoldalias",
+        },
+      },
+      contextValue: makeUserContext(tx, admin.account, { fedCtx }),
+      onError: "NO_PROPAGATE",
+    });
+    assert.equal(removed.errors, undefined);
+    assert.deepEqual(toPlainJson(removed.data), {
+      removeAccountMigrationAlias: {
+        __typename: "RemoveAccountMigrationAliasPayload",
+        account: {
+          actor: {
+            aliases: [],
+          },
+        },
+      },
+    });
+
+    // A non-admin member cannot manage the organization's migration aliases.
+    const byMember = await execute({
+      schema,
+      document: addAccountMigrationAliasMutation,
+      variableValues: {
+        input: {
+          accountId: encodeGlobalID("Account", organization.account.id),
+          actor: "@orgoldalias@old.example",
+        },
+      },
+      contextValue: makeUserContext(tx, member.account, { fedCtx }),
+      onError: "NO_PROPAGATE",
+    });
+    assert.equal(byMember.errors, undefined);
+    assert.equal(
+      (toPlainJson(byMember.data) as {
+        addAccountMigrationAlias?: { __typename?: string };
+      }).addAccountMigrationAlias?.__typename,
+      "NotAuthorizedError",
+    );
+
+    // Neither can an account that is not a member at all.
+    const byOutsider = await execute({
+      schema,
+      document: addAccountMigrationAliasMutation,
+      variableValues: {
+        input: {
+          accountId: encodeGlobalID("Account", organization.account.id),
+          actor: "@orgoldalias@old.example",
+        },
+      },
+      contextValue: makeUserContext(tx, outsider.account, { fedCtx }),
+      onError: "NO_PROPAGATE",
+    });
+    assert.equal(byOutsider.errors, undefined);
+    assert.equal(
+      (toPlainJson(byOutsider.data) as {
+        addAccountMigrationAlias?: { __typename?: string };
+      }).addAccountMigrationAlias?.__typename,
+      "NotAuthorizedError",
+    );
+  });
+});
+
 test("deleteAccount deletes the viewer account and session", async () => {
   await withRollback(async (tx) => {
     const { kv } = createTestKv();
diff --git a/graphql/account.ts b/graphql/account.ts
index e6813b61..4c0294d7 100644
--- a/graphql/account.ts
+++ b/graphql/account.ts
@@ -218,12 +218,25 @@ async function getAuthorizedMigrationAccount(
     throw new NotAuthenticatedError();
   }
   if (!validateUuid(accountId)) throw new InvalidInputError("accountId");
-  if (session.accountId !== accountId) throw new NotAuthorizedError();
   const account = await ctx.db.query.accountTable.findFirst({
     where: { id: accountId },
     with: { actor: true },
   });
-  if (account?.actor == null) throw new InvalidInputError("accountId");
+  // Treat a nonexistent account the same as an unauthorized one so the error
+  // does not leak whether the id exists (the input description promises that
+  // any account id the viewer cannot manage returns `NotAuthorizedError`).
+  if (
+    account == null ||
+    !(await viewerCanManageAccountSettings(
+      ctx,
+      account.id,
+      account.kind,
+      session.accountId,
+    ))
+  ) {
+    throw new NotAuthorizedError();
+  }
+  if (account.actor == null) throw new InvalidInputError("accountId");
   return account;
 }
 
@@ -1445,17 +1458,21 @@ builder.relayMutationField(
   "addAccountMigrationAlias",
   {
     description:
-      "Add a previous account actor as an ActivityPub migration alias for " +
-      "the authenticated viewer's local account. The stored value is the " +
-      "resolved actor IRI, which is then advertised as `alsoKnownAs` on " +
-      "the local actor document so a later remote `Move` can be validated.",
+      "Add a previous account actor as an ActivityPub migration alias for a " +
+      "local account the authenticated viewer can manage: their own personal " +
+      "account, or an `ORGANIZATION` account they are an accepted `admin` of. " +
+      "The stored value is the resolved actor IRI, which is then advertised " +
+      "as `alsoKnownAs` on the local actor document so a later remote `Move` " +
+      "can be validated.",
     inputFields: (t) => ({
       accountId: t.globalID({
         for: Account,
         required: true,
         description:
-          "The `Account` global id owned by the authenticated viewer. " +
-          "Passing another account id returns `NotAuthorizedError`.",
+          "The `Account` global id to add the alias to. The authenticated " +
+          "viewer must be able to manage that account: its personal holder, " +
+          "or an accepted `admin` of an `ORGANIZATION` account. Any other " +
+          "account id returns `NotAuthorizedError`.",
       }),
       actor: t.string({
         required: true,
@@ -1506,17 +1523,19 @@ builder.relayMutationField(
   "removeAccountMigrationAlias",
   {
     description:
-      "Remove one ActivityPub migration alias from the authenticated " +
-      "viewer's local account. Removing an alias only changes the new " +
-      "account's `alsoKnownAs` list; it does not send or retract a remote " +
-      "`Move` activity.",
+      "Remove one ActivityPub migration alias from a local account the " +
+      "authenticated viewer can manage: their own personal account, or an " +
+      "`ORGANIZATION` account they are an accepted `admin` of. Removing an " +
+      "alias only changes the account's `alsoKnownAs` list; it does not send " +
+      "or retract a remote `Move` activity.",
     inputFields: (t) => ({
       accountId: t.globalID({
         for: Account,
         required: true,
-        description:
-          "The `Account` global id owned by the authenticated viewer. " +
-          "Passing another account id returns `NotAuthorizedError`.",
+        description: "The `Account` global id to remove the alias from. The " +
+          "authenticated viewer must be able to manage that account: its " +
+          "personal holder, or an accepted `admin` of an `ORGANIZATION` " +
+          "account. Any other account id returns `NotAuthorizedError`.",
       }),
       alias: t.field({
         type: "URL",
diff --git a/graphql/schema.graphql b/graphql/schema.graphql
index f3b7b05a..0e64651a 100644
--- a/graphql/schema.graphql
+++ b/graphql/schema.graphql
@@ -872,11 +872,11 @@ type ActorViewerInteractionsConnectionEdge {
 }
 
 """
-Add a previous account actor as an ActivityPub migration alias for the authenticated viewer's local account. The stored value is the resolved actor IRI, which is then advertised as `alsoKnownAs` on the local actor document so a later remote `Move` can be validated.
+Add a previous account actor as an ActivityPub migration alias for a local account the authenticated viewer can manage: their own personal account, or an `ORGANIZATION` account they are an accepted `admin` of. The stored value is the resolved actor IRI, which is then advertised as `alsoKnownAs` on the local actor document so a later remote `Move` can be validated.
 """
 input AddAccountMigrationAliasInput {
   """
-  The `Account` global id owned by the authenticated viewer. Passing another account id returns `NotAuthorizedError`.
+  The `Account` global id to add the alias to. The authenticated viewer must be able to manage that account: its personal holder, or an accepted `admin` of an `ORGANIZATION` account. Any other account id returns `NotAuthorizedError`.
   """
   accountId: ID!
 
@@ -5287,11 +5287,11 @@ type RelaySubscription implements Node {
 }
 
 """
-Remove one ActivityPub migration alias from the authenticated viewer's local account. Removing an alias only changes the new account's `alsoKnownAs` list; it does not send or retract a remote `Move` activity.
+Remove one ActivityPub migration alias from a local account the authenticated viewer can manage: their own personal account, or an `ORGANIZATION` account they are an accepted `admin` of. Removing an alias only changes the account's `alsoKnownAs` list; it does not send or retract a remote `Move` activity.
 """
 input RemoveAccountMigrationAliasInput {
   """
-  The `Account` global id owned by the authenticated viewer. Passing another account id returns `NotAuthorizedError`.
+  The `Account` global id to remove the alias from. The authenticated viewer must be able to manage that account: its personal holder, or an accepted `admin` of an `ORGANIZATION` account. Any other account id returns `NotAuthorizedError`.
   """
   accountId: ID!
 
diff --git a/web-next/src/locales/en-US/messages.po b/web-next/src/locales/en-US/messages.po
index 1d49af97..e724b09e 100644
--- a/web-next/src/locales/en-US/messages.po
+++ b/web-next/src/locales/en-US/messages.po
@@ -5459,10 +5459,10 @@ msgstr "You can only view your own bookmarks"
 msgid "You can only view your own drafts"
 msgstr "You can only view your own drafts"
 
-#: src/routes/(root)/[handle]/settings/account.tsx:1670
-#: src/routes/(root)/[handle]/settings/account.tsx:1721
-msgid "You can prepare migration only for your own account."
-msgstr "You can prepare migration only for your own account."
+#: src/routes/(root)/[handle]/settings/account.tsx:1676
+#: src/routes/(root)/[handle]/settings/account.tsx:1727
+msgid "You can prepare migration only for accounts you can manage."
+msgstr "You can prepare migration only for accounts you can manage."
 
 #: src/routes/(root)/[handle]/settings/account.tsx:979
 msgid "You do not belong to any organizations yet."
diff --git a/web-next/src/locales/ja-JP/messages.po b/web-next/src/locales/ja-JP/messages.po
index 699bb6a2..2dce5d9b 100644
--- a/web-next/src/locales/ja-JP/messages.po
+++ b/web-next/src/locales/ja-JP/messages.po
@@ -5455,10 +5455,10 @@ msgstr "自分のブックマークのみ表示できます"
 msgid "You can only view your own drafts"
 msgstr "自分の下書きのみ表示できます"
 
-#: src/routes/(root)/[handle]/settings/account.tsx:1670
-#: src/routes/(root)/[handle]/settings/account.tsx:1721
-msgid "You can prepare migration only for your own account."
-msgstr "自分のアカウントでのみ移行を準備できます。"
+#: src/routes/(root)/[handle]/settings/account.tsx:1676
+#: src/routes/(root)/[handle]/settings/account.tsx:1727
+msgid "You can prepare migration only for accounts you can manage."
+msgstr "管理できるアカウントでのみ移行を準備できます。"
 
 #: src/routes/(root)/[handle]/settings/account.tsx:979
 msgid "You do not belong to any organizations yet."
diff --git a/web-next/src/locales/ko-KR/messages.po b/web-next/src/locales/ko-KR/messages.po
index 9e726bea..2438f01b 100644
--- a/web-next/src/locales/ko-KR/messages.po
+++ b/web-next/src/locales/ko-KR/messages.po
@@ -5455,10 +5455,10 @@ msgstr "자신의 북마크만 볼 수 있습니다"
 msgid "You can only view your own drafts"
 msgstr "자신의 초고만 볼 수 있습니다"
 
-#: src/routes/(root)/[handle]/settings/account.tsx:1670
-#: src/routes/(root)/[handle]/settings/account.tsx:1721
-msgid "You can prepare migration only for your own account."
-msgstr "자신의 계정에서만 이전을 준비할 수 있습니다."
+#: src/routes/(root)/[handle]/settings/account.tsx:1676
+#: src/routes/(root)/[handle]/settings/account.tsx:1727
+msgid "You can prepare migration only for accounts you can manage."
+msgstr "관리할 수 있는 계정에서만 이전을 준비할 수 있습니다."
 
 #: src/routes/(root)/[handle]/settings/account.tsx:979
 msgid "You do not belong to any organizations yet."
diff --git a/web-next/src/locales/zh-CN/messages.po b/web-next/src/locales/zh-CN/messages.po
index cd941203..49cc7274 100644
--- a/web-next/src/locales/zh-CN/messages.po
+++ b/web-next/src/locales/zh-CN/messages.po
@@ -5455,10 +5455,10 @@ msgstr "您只能查看自己的收藏"
 msgid "You can only view your own drafts"
 msgstr "您只能查看自己的草稿"
 
-#: src/routes/(root)/[handle]/settings/account.tsx:1670
-#: src/routes/(root)/[handle]/settings/account.tsx:1721
-msgid "You can prepare migration only for your own account."
-msgstr "你只能为自己的账户准备迁移。"
+#: src/routes/(root)/[handle]/settings/account.tsx:1676
+#: src/routes/(root)/[handle]/settings/account.tsx:1727
+msgid "You can prepare migration only for accounts you can manage."
+msgstr "你只能为你能管理的账户准备迁移。"
 
 #: src/routes/(root)/[handle]/settings/account.tsx:979
 msgid "You do not belong to any organizations yet."
diff --git a/web-next/src/locales/zh-TW/messages.po b/web-next/src/locales/zh-TW/messages.po
index 10784ee8..fef9257b 100644
--- a/web-next/src/locales/zh-TW/messages.po
+++ b/web-next/src/locales/zh-TW/messages.po
@@ -5455,10 +5455,10 @@ msgstr "您只能檢視自己的收藏"
 msgid "You can only view your own drafts"
 msgstr "您只能檢視自己的草稿"
 
-#: src/routes/(root)/[handle]/settings/account.tsx:1670
-#: src/routes/(root)/[handle]/settings/account.tsx:1721
-msgid "You can prepare migration only for your own account."
-msgstr "你只能為自己的帳戶準備遷移。"
+#: src/routes/(root)/[handle]/settings/account.tsx:1676
+#: src/routes/(root)/[handle]/settings/account.tsx:1727
+msgid "You can prepare migration only for accounts you can manage."
+msgstr "你只能為你能管理的帳戶準備遷移。"
 
 #: src/routes/(root)/[handle]/settings/account.tsx:979
 msgid "You do not belong to any organizations yet."
diff --git a/web-next/src/routes/(root)/[handle]/settings/account.tsx b/web-next/src/routes/(root)/[handle]/settings/account.tsx
index 4f0728ef..703fc4d8 100644
--- a/web-next/src/routes/(root)/[handle]/settings/account.tsx
+++ b/web-next/src/routes/(root)/[handle]/settings/account.tsx
@@ -538,22 +538,7 @@ export default function AccountSettingsPage() {
                                 account={account}
                                 viewer={viewer}
                               />
-                              <Card>
-                                <CardHeader>
-                                  <CardTitle>
-                                    {t`Account migration`}
-                                  </CardTitle>
-                                  <CardDescription>
-                                    {t`Prepare this account as the destination for a Mastodon-style move.`}
-                                  </CardDescription>
-                                </CardHeader>
-                                <CardContent>
-                                  <AccountMigrationAliasesForm
-                                    id={account.id}
-                                    aliases={account.actor.aliases}
-                                  />
-                                </CardContent>
-                              </Card>
+                              <AccountMigrationCard account={account} />
                               <Card>
                                 <CardHeader>
                                   <CardTitle>{t`Delete account`}</CardTitle>
@@ -577,6 +562,7 @@ export default function AccountSettingsPage() {
                           account={account}
                           viewerId={data.viewer?.id ?? null}
                         />
+                        <AccountMigrationCard account={account} />
                         <Card>
                           <CardHeader>
                             <CardTitle>{t`Delete organization`}</CardTitle>
@@ -1609,6 +1595,30 @@ function OrganizationMemberManagementCard(props: {
   );
 }
 
+interface AccountMigrationCardProps {
+  account: AccountPageAccount;
+}
+
+function AccountMigrationCard(props: AccountMigrationCardProps) {
+  const { t } = useLingui();
+  return (
+    <Card>
+      <CardHeader>
+        <CardTitle>{t`Account migration`}</CardTitle>
+        <CardDescription>
+          {t`Prepare this account as the destination for a Mastodon-style move.`}
+        </CardDescription>
+      </CardHeader>
+      <CardContent>
+        <AccountMigrationAliasesForm
+          id={props.account.id}
+          aliases={props.account.actor.aliases}
+        />
+      </CardContent>
+    </Card>
+  );
+}
+
 interface AccountMigrationAliasesFormProps {
   aliases: readonly string[];
   id: string;
@@ -1667,7 +1677,7 @@ function AccountMigrationAliasesForm(
         if (result?.__typename === "NotAuthorizedError") {
           showMutationError(
             t`Cannot update this account`,
-            t`You can prepare migration only for your own account.`,
+            t`You can prepare migration only for accounts you can manage.`,
           );
           return;
         }
@@ -1718,7 +1728,7 @@ function AccountMigrationAliasesForm(
         if (result?.__typename === "NotAuthorizedError") {
           showMutationError(
             t`Cannot update this account`,
-            t`You can prepare migration only for your own account.`,
+            t`You can prepare migration only for accounts you can manage.`,
           );
           return;
         }