diff --git a/app/Http/Controllers/OrganizationSitemapController.php b/app/Http/Controllers/OrganizationSitemapController.php
new file mode 100644
index 000000000..1a13566ed
--- /dev/null
+++ b/app/Http/Controllers/OrganizationSitemapController.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Controllers;
+
+use App\Http\Requests\ShowOrganizationSitemapRequest;
+use App\Queries\SitemapQuery;
+use Illuminate\Http\Response;
+
+final readonly class OrganizationSitemapController
+{
+    public function show(ShowOrganizationSitemapRequest $request, SitemapQuery $sitemaps): Response
+    {
+        return response()->view('sitemaps.urls', [
+            'urls' => array_map(fn (array $organization): array => [
+                'loc' => route('user.show', $organization['handle']),
+                'lastmod' => $organization['updated_at']->toAtomString(),
+            ], $sitemaps->organizationsIn($request->month())),
+        ], headers: ['Content-Type' => 'application/xml; charset=UTF-8']);
+    }
+}
diff --git a/app/Http/Controllers/SitemapController.php b/app/Http/Controllers/SitemapController.php
index 076e5ffcd..9b412e4b6 100644
--- a/app/Http/Controllers/SitemapController.php
+++ b/app/Http/Controllers/SitemapController.php
@@ -17,6 +17,10 @@ public function index(SitemapQuery $sitemaps): Response
                     'loc' => route('user-sitemap.show', $month['month']),
                     'lastmod' => $month['updated_at']->toAtomString(),
                 ], $sitemaps->userMonths()),
+                ...array_map(fn (array $month): array => [
+                    'loc' => route('organization-sitemap.show', $month['month']),
+                    'lastmod' => $month['updated_at']->toAtomString(),
+                ], $sitemaps->organizationMonths()),
                 ...array_map(fn (array $day): array => [
                     'loc' => route('commit-sitemap.show', $day['day']),
                     'lastmod' => $day['updated_at']->toAtomString(),
diff --git a/app/Http/Requests/ShowOrganizationSitemapRequest.php b/app/Http/Requests/ShowOrganizationSitemapRequest.php
new file mode 100644
index 000000000..77b5bd649
--- /dev/null
+++ b/app/Http/Requests/ShowOrganizationSitemapRequest.php
@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Requests;
+
+use App\Queries\SitemapQuery;
+use Carbon\CarbonImmutable;
+use Illuminate\Auth\Access\Response;
+use Illuminate\Foundation\Http\FormRequest;
+
+final class ShowOrganizationSitemapRequest extends FormRequest
+{
+    /**
+     * A month that doesn't exist, like 2026-13, or without an organization to list, has no sitemap, so search
+     * engines drop a sitemap once everything it listed is gone.
+     */
+    public function authorize(): Response
+    {
+        return $this->month()->format('Y-m') === $this->route('month') && resolve(SitemapQuery::class)->hasOrganizationsIn($this->month())
+            ? Response::allow()
+            : Response::denyAsNotFound();
+    }
+
+    /**
+     * @return array{}
+     */
+    public function rules(): array
+    {
+        return [];
+    }
+
+    /**
+     * The start of the month whose new organizations the sitemap lists, in UTC.
+     */
+    public function month(): CarbonImmutable
+    {
+        $month = $this->route('month');
+        assert(is_string($month));
+
+        $start = CarbonImmutable::createFromFormat('!Y-m', $month);
+        assert($start instanceof CarbonImmutable);
+
+        return $start;
+    }
+}
diff --git a/app/Queries/SitemapQuery.php b/app/Queries/SitemapQuery.php
index 6b0a8ec02..b2319fc8f 100644
--- a/app/Queries/SitemapQuery.php
+++ b/app/Queries/SitemapQuery.php
@@ -4,16 +4,19 @@
 
 namespace App\Queries;
 
+use App\Enums\ProfileType;
+use App\Enums\TopicType;
 use App\Models\Commit;
+use App\Models\Profile;
 use App\Models\User;
 use Carbon\CarbonImmutable;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Support\Facades\DB;
 
 /**
- * Profiles are listed by the month they signed up and commits by the day they were written, in UTC, so a URL never
- * moves to another sitemap and the older sitemaps rarely change. A sitemap may list 50,000 URLs, far more than a month
- * of sign-ups or a day of commits.
+ * Profiles are listed by the month they signed up, organizations by the month their page was made, and commits by the
+ * day they were written, in UTC, so a URL never moves to another sitemap and the older sitemaps rarely change. A
+ * sitemap may list 50,000 URLs, far more than a month of sign-ups or a day of commits.
  */
 final readonly class SitemapQuery
 {
@@ -40,6 +43,29 @@ public function userMonths(): array
         ], $months);
     }
 
+    /**
+     * The months, as "2026-10", in which the organizations' pages were made, oldest first, with when the last of them
+     * changed.
+     *
+     * @return list<array{month: string, updated_at: CarbonImmutable}>
+     */
+    public function organizationMonths(): array
+    {
+        /** @var list<object{month: string, updated_at: string}> $months */
+        $months = DB::query()
+            ->fromSub($this->organizations(), 'organizations')
+            ->selectRaw("to_char(created_at, 'YYYY-MM') as month, max(updated_at) as updated_at")
+            ->groupBy('month')
+            ->orderBy('month')
+            ->get()
+            ->all();
+
+        return array_map(fn (object $month): array => [
+            'month' => $month->month,
+            'updated_at' => CarbonImmutable::parse($month->updated_at),
+        ], $months);
+    }
+
     /**
      * The days, as "2026-10-29", on which approved commits were written, oldest first, with when the last of them
      * changed, so search engines only read again the sitemaps that changed.
@@ -68,6 +94,11 @@ public function hasUsersIn(CarbonImmutable $month): bool
         return $this->usersSignedUpIn($month)->exists();
     }
 
+    public function hasOrganizationsIn(CarbonImmutable $month): bool
+    {
+        return $this->organizationsMadeIn($month)->exists();
+    }
+
     public function hasCommitsOn(CarbonImmutable $day): bool
     {
         return $this->commitsWrittenOn($day)->exists();
@@ -93,6 +124,26 @@ public function usersIn(CarbonImmutable $month): array
         ], $users);
     }
 
+    /**
+     * Read as plain rows rather than models, like the profiles.
+     *
+     * @return list<array{handle: string, updated_at: CarbonImmutable}>
+     */
+    public function organizationsIn(CarbonImmutable $month): array
+    {
+        /** @var list<object{handle: string, updated_at: string}> $organizations */
+        $organizations = $this->organizationsMadeIn($month)
+            ->orderBy('profiles.id')
+            ->toBase()
+            ->get()
+            ->all();
+
+        return array_map(fn (object $organization): array => [
+            'handle' => $organization->handle,
+            'updated_at' => CarbonImmutable::parse($organization->updated_at),
+        ], $organizations);
+    }
+
     /**
      * Read as plain rows rather than models, with the author and the images in the same query, since a day lists
      * thousands of them.
@@ -163,6 +214,41 @@ private function usersSignedUpIn(CarbonImmutable $month): Builder
             ->where('users.created_at', '<', $month->addMonth());
     }
 
+    /**
+     * Every organization has a page, but not the placeholder handle of a profile whose handle was taken on GitHub,
+     * which its next sync replaces. An organization's page changes with its GitHub profile and the approved commits
+     * that mention it.
+     *
+     * @return Builder<Profile>
+     */
+    private function organizations(): Builder
+    {
+        $lastMentions = $this->commits()
+            ->toBase()
+            ->join('commit_topics', 'commit_topics.commit_id', '=', 'commits.id')
+            ->where('commit_topics.topic_type', TopicType::Organization)
+            ->select('commit_topics.topic_id')
+            ->selectRaw('max(commits.updated_at) as updated_at')
+            ->groupBy('commit_topics.topic_id');
+
+        return Profile::query()
+            ->leftJoinSub($lastMentions, 'last_mentions', 'last_mentions.topic_id', '=', 'profiles.id')
+            ->where('profiles.type', ProfileType::Organization)
+            ->where('profiles.handle', 'not like', '\_%')
+            ->select(['profiles.handle', 'profiles.created_at'])
+            ->selectRaw('greatest(profiles.updated_at, last_mentions.updated_at) as updated_at');
+    }
+
+    /**
+     * @return Builder<Profile>
+     */
+    private function organizationsMadeIn(CarbonImmutable $month): Builder
+    {
+        return $this->organizations()
+            ->where('profiles.created_at', '>=', $month)
+            ->where('profiles.created_at', '<', $month->addMonth());
+    }
+
     private function commits(): CommitBuilder
     {
         return Commit::query()->approved();
diff --git a/routes/web.php b/routes/web.php
index e5bb2d572..f611835f4 100644
--- a/routes/web.php
+++ b/routes/web.php
@@ -76,6 +76,7 @@
 use App\Http\Controllers\OperationsEventController;
 use App\Http\Controllers\OrganizationController;
 use App\Http\Controllers\OrganizationMentionController;
+use App\Http\Controllers\OrganizationSitemapController;
 use App\Http\Controllers\OrgArchiveController;
 use App\Http\Controllers\OrgController;
 use App\Http\Controllers\OrgMemberController;
@@ -237,6 +238,9 @@
     Route::get('sitemaps/users-{month}.xml', [UserSitemapController::class, 'show'])
         ->where('month', '[0-9]{4}-[0-9]{2}')
         ->name('user-sitemap.show');
+    Route::get('sitemaps/organizations-{month}.xml', [OrganizationSitemapController::class, 'show'])
+        ->where('month', '[0-9]{4}-[0-9]{2}')
+        ->name('organization-sitemap.show');
     Route::get('sitemaps/commits-{day}.xml', [CommitSitemapController::class, 'show'])
         ->where('day', '[0-9]{4}-[0-9]{2}-[0-9]{2}')
         ->name('commit-sitemap.show');
diff --git a/tests/Feature/Controllers/OrganizationSitemapControllerTest.php b/tests/Feature/Controllers/OrganizationSitemapControllerTest.php
new file mode 100644
index 000000000..9df57d3e7
--- /dev/null
+++ b/tests/Feature/Controllers/OrganizationSitemapControllerTest.php
@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Actions\CreateCommitTopics;
+use App\Models\Commit;
+use App\Models\Profile;
+use App\Models\User;
+
+it('lists every organization whose page was made that month', function (): void {
+    $laravel = Profile::factory()->organization()->create(['handle' => 'laravel', 'created_at' => '2026-10-01 00:00:00']);
+    Profile::factory()->organization()->create(['handle' => 'symfony', 'created_at' => '2026-10-31 23:59:59']);
+    resolve(CreateCommitTopics::class)->handle(Commit::factory()->create(['body' => 'Thanks @laravel']), ['laravel' => $laravel->id]);
+    Profile::factory()->organization()->create(['handle' => 'last-month', 'created_at' => '2026-09-30 23:59:59']);
+    Profile::factory()->organization()->create(['handle' => 'next-month', 'created_at' => '2026-11-01 00:00:00']);
+    Profile::factory()->organization()->create(['handle' => '_renamed-123', 'created_at' => '2026-10-15 00:00:00']);
+    Commit::factory()->for(User::factory()->state(['handle' => 'octocat', 'created_at' => '2026-10-15 00:00:00']))->create();
+
+    $response = $this->get(route('organization-sitemap.show', '2026-10'));
+
+    $response->assertOk()
+        ->assertHeader('Content-Type', 'application/xml; charset=UTF-8')
+        ->assertSeeInOrder([
+            '<loc>'.route('user.show', 'laravel').'</loc>',
+            '<loc>'.route('user.show', 'symfony').'</loc>',
+        ], false)
+        ->assertDontSee('last-month')
+        ->assertDontSee('next-month')
+        ->assertDontSee('_renamed-123')
+        ->assertDontSee('octocat');
+
+    expect(mb_substr_count($response->getContent(), '<url>'))->toBe(2);
+});
+
+it('dates an organization by the last change of its GitHub profile or the approved commits that mention it', function (string $profile, string $mention, string $lastmod): void {
+    $this->travelTo('2026-10-01 00:00:00');
+    $laravel = Profile::factory()->organization()->create(['handle' => 'laravel']);
+    Profile::query()->whereKey($laravel->id)->toBase()->update(['updated_at' => $profile]);
+    resolve(CreateCommitTopics::class)->handle(Commit::factory()->create(['body' => '@laravel', 'updated_at' => $mention]), ['laravel' => $laravel->id]);
+    resolve(CreateCommitTopics::class)->handle(Commit::factory()->pending()->create(['body' => '@laravel', 'updated_at' => '2026-10-29 00:00:00']), ['laravel' => $laravel->id]);
+    resolve(CreateCommitTopics::class)->handle(Commit::factory()->create(['body' => '@symfony', 'updated_at' => '2026-10-28 00:00:00']), ['symfony' => Profile::factory()->organization()->create()->id]);
+
+    $this->get(route('organization-sitemap.show', '2026-10'))
+        ->assertOk()
+        ->assertSee('<loc>'.route('user.show', 'laravel')."</loc>\n        <lastmod>{$lastmod}</lastmod>", false);
+})->with([
+    'its GitHub profile' => ['2026-10-20 10:00:00', '2026-10-10 10:00:00', '2026-10-20T10:00:00+00:00'],
+    'a commit that mentions it' => ['2026-10-10 10:00:00', '2026-10-20 10:00:00', '2026-10-20T10:00:00+00:00'],
+]);
+
+it('has no sitemap for a month without organizations', function (): void {
+    Profile::factory()->organization()->create(['created_at' => '2026-09-15 00:00:00']);
+    Profile::factory()->organization()->create(['handle' => '_renamed-123', 'created_at' => '2026-10-15 00:00:00']);
+
+    $this->get(route('organization-sitemap.show', '2026-10'))->assertNotFound();
+});
+
+it('has no sitemap for a month that does not exist', function (string $month): void {
+    $this->get("/sitemaps/organizations-{$month}.xml")->assertNotFound();
+})->with(['2026-13', '2026-00', '2026-1', 'abc']);
diff --git a/tests/Feature/Controllers/SitemapControllerTest.php b/tests/Feature/Controllers/SitemapControllerTest.php
index 1459aa621..48da94841 100644
--- a/tests/Feature/Controllers/SitemapControllerTest.php
+++ b/tests/Feature/Controllers/SitemapControllerTest.php
@@ -3,9 +3,11 @@
 declare(strict_types=1);
 
 use App\Models\Commit;
+use App\Models\Profile;
 use App\Models\User;
 
-it('lists a sitemap for every month of sign-ups and every day of commits', function (): void {
+it('lists a sitemap for every month of sign-ups, every month of organizations and every day of commits', function (): void {
+    Profile::factory()->organization()->create(['created_at' => '2026-08-15 00:00:00']);
     $user = User::factory()->create(['created_at' => '2026-09-30 23:59:59']);
     Commit::factory()->for($user)->create(['created_at' => '2026-10-15 08:00:00']);
     Commit::factory()->for($user)->create(['created_at' => '2026-10-15 23:59:59']);
@@ -19,11 +21,12 @@
         ->assertSeeInOrder([
             '<loc>'.route('user-sitemap.show', '2026-09').'</loc>',
             '<loc>'.route('user-sitemap.show', now()->format('Y-m')).'</loc>',
+            '<loc>'.route('organization-sitemap.show', '2026-08').'</loc>',
             '<loc>'.route('commit-sitemap.show', '2026-10-15').'</loc>',
             '<loc>'.route('commit-sitemap.show', '2026-10-29').'</loc>',
         ], false);
 
-    expect(mb_substr_count($response->getContent(), '<sitemap>'))->toBe(4);
+    expect(mb_substr_count($response->getContent(), '<sitemap>'))->toBe(5);
 })->freezeTime();
 
 it('leaves out the days and months with nothing approved', function (): void {
@@ -39,17 +42,18 @@
 
 it('serves every sitemap without cookies, so a cache can share it', function (string $route): void {
     Commit::factory()->create();
+    Profile::factory()->organization()->create();
 
     $response = $this->get(route($route, match ($route) {
         'sitemap.index' => [],
-        'user-sitemap.show' => now()->format('Y-m'),
+        'user-sitemap.show', 'organization-sitemap.show' => now()->format('Y-m'),
         'commit-sitemap.show' => now()->toDateString(),
     }));
 
     $response->assertOk()
         ->assertHeader('Cache-Control', 'max-age=3600, public')
         ->assertHeaderMissing('Set-Cookie');
-})->with(['sitemap.index', 'user-sitemap.show', 'commit-sitemap.show'])->freezeTime();
+})->with(['sitemap.index', 'user-sitemap.show', 'organization-sitemap.show', 'commit-sitemap.show'])->freezeTime();
 
 it('dates every sitemap by the last change of what it lists', function (): void {
     $this->travelTo('2026-10-01 00:00:00');