diff --git a/workers/plugin-marketplace/src/index.test.ts b/workers/plugin-marketplace/src/index.test.ts
index c09d60eb..b84ed14d 100644
--- a/workers/plugin-marketplace/src/index.test.ts
+++ b/workers/plugin-marketplace/src/index.test.ts
@@ -9,6 +9,20 @@ class MemoryR2 {
   }
 }
 
+class MemoryKV {
+  constructor(private readonly keyNames: string[]) {}
+
+  async list(options?: { prefix?: string }): Promise<{
+    keys: Array<{ name: string }>;
+  }> {
+    return {
+      keys: this.keyNames
+        .filter((name) => !options?.prefix || name.startsWith(options.prefix))
+        .map((name) => ({ name })),
+    };
+  }
+}
+
 function repo(overrides: Record<string, unknown> = {}): Record<string, unknown> {
   return {
     id: 1,
@@ -34,9 +48,10 @@ function repo(overrides: Record<string, unknown> = {}): Record<string, unknown>
   };
 }
 
-function env(bucket = new MemoryR2()): Env {
+function env(bucket = new MemoryR2(), blacklist?: MemoryKV): Env {
   return {
     PLUGIN_MARKETPLACE_BUCKET: bucket,
+    PLUGIN_MARKETPLACE_BLACKLIST: blacklist,
     GITHUB_TOKEN: "token",
   };
 }
@@ -191,6 +206,68 @@ describe("refreshPlugins", () => {
     ]);
   });
 
+  test("excludes repositories listed in the KV blacklist", async () => {
+    const fetch = async (): Promise<Response> =>
+      Response.json({
+        total_count: 2,
+        items: [
+          repo({
+            id: 1,
+            full_name: "example/not-a-plugin",
+            owner: { login: "example" },
+            name: "not-a-plugin",
+            html_url: "https://github.com/example/not-a-plugin",
+          }),
+          repo({
+            id: 2,
+            full_name: "ogulcancelik/herdr-plugin-example",
+            owner: { login: "ogulcancelik" },
+            name: "herdr-plugin-example",
+            html_url: "https://github.com/ogulcancelik/herdr-plugin-example",
+          }),
+        ],
+      });
+    const bucket = new MemoryR2();
+
+    const result = await refreshPlugins(env(bucket, new MemoryKV(["repo:example/not-a-plugin"])), {
+      fetch,
+      logger: { error() {} },
+    });
+
+    expect(result.ok).toBe(true);
+    const snapshot = JSON.parse(bucket.objects.get("plugins/index.json")?.value ?? "");
+    expect(snapshot.plugins.map((plugin: { fullName: string }) => plugin.fullName)).toEqual([
+      "ogulcancelik/herdr-plugin-example",
+    ]);
+  });
+
+  test("writes an empty snapshot when every listable repository is blacklisted", async () => {
+    const fetch = async (): Promise<Response> =>
+      Response.json({
+        total_count: 1,
+        items: [
+          repo({
+            id: 1,
+            full_name: "example/not-a-plugin",
+            owner: { login: "example" },
+            name: "not-a-plugin",
+            html_url: "https://github.com/example/not-a-plugin",
+          }),
+        ],
+      });
+    const bucket = new MemoryR2();
+    await bucket.put("plugins/index.json", '{"schemaVersion":1,"plugins":[{"id":1}]}');
+
+    const result = await refreshPlugins(env(bucket, new MemoryKV(["repo:example/not-a-plugin"])), {
+      fetch,
+      logger: { error() {} },
+    });
+
+    expect(result.ok).toBe(true);
+    const snapshot = JSON.parse(bucket.objects.get("plugins/index.json")?.value ?? "");
+    expect(snapshot.plugins).toEqual([]);
+  });
+
   test("marks snapshots truncated at the GitHub search cap", async () => {
     const fetch = async (): Promise<Response> => {
       const items = Array.from({ length: 100 }, (_, index) =>
diff --git a/workers/plugin-marketplace/src/index.ts b/workers/plugin-marketplace/src/index.ts
index b85abdb8..e4523340 100644
--- a/workers/plugin-marketplace/src/index.ts
+++ b/workers/plugin-marketplace/src/index.ts
@@ -3,6 +3,7 @@ const SNAPSHOT_CACHE_CONTROL = "public, max-age=300, s-maxage=1800, stale-while-
 const GITHUB_QUERY = "topic:herdr-plugin is:public";
 const GITHUB_API_VERSION = "2022-11-28";
 const GITHUB_SEARCH_URL = "https://api.github.com/search/repositories";
+const BLACKLIST_REPO_KEY_PREFIX = "repo:";
 const PER_PAGE = 100;
 const MAX_REPOS = 1000;
 const REQUEST_TIMEOUT_MS = 10_000;
@@ -20,6 +21,13 @@ type R2Bucket = {
   ): Promise<unknown>;
 };
 
+type KVNamespace = {
+  list(options?: { prefix?: string; cursor?: string }): Promise<{
+    keys: Array<{ name: string }>;
+    cursor?: string;
+  }>;
+};
+
 type ExecutionContext = {
   waitUntil(promise: Promise<unknown>): void;
 };
@@ -28,6 +36,7 @@ type ScheduledController = unknown;
 
 export type Env = {
   PLUGIN_MARKETPLACE_BUCKET: R2Bucket;
+  PLUGIN_MARKETPLACE_BLACKLIST?: KVNamespace;
   GITHUB_TOKEN?: string;
 };
 
@@ -99,11 +108,19 @@ export async function refreshPlugins(
 
     const fetchFn = options.fetch ?? fetch;
     const result = await fetchGitHubRepositories(fetchFn, token);
-    const plugins = normalizeRepositories(result.repositories);
-    if (plugins.length === 0) {
+    const normalizedPlugins = normalizeRepositories(result.repositories);
+    if (normalizedPlugins.length === 0) {
       throw new Error("GitHub returned no listable plugin repositories");
     }
 
+    const blockedRepositories = await readBlacklistedRepositories(env);
+    const plugins =
+      blockedRepositories.size === 0
+        ? normalizedPlugins
+        : normalizedPlugins.filter(
+            (plugin) => !blockedRepositories.has(plugin.fullName.toLowerCase()),
+          );
+
     const snapshot: PluginSnapshot = {
       schemaVersion: 1,
       generatedAt: (options.now ?? new Date()).toISOString(),
@@ -216,6 +233,28 @@ export function normalizeRepositories(repositories: GitHubRepository[]): PluginL
     .sort(comparePlugins);
 }
 
+async function readBlacklistedRepositories(env: Env): Promise<Set<string>> {
+  const kv = env.PLUGIN_MARKETPLACE_BLACKLIST;
+  const blockedRepositories = new Set<string>();
+  if (!kv) {
+    return blockedRepositories;
+  }
+
+  let cursor: string | undefined;
+  do {
+    const page = await kv.list({ prefix: BLACKLIST_REPO_KEY_PREFIX, cursor });
+    for (const key of page.keys) {
+      const repository = key.name.slice(BLACKLIST_REPO_KEY_PREFIX.length).trim().toLowerCase();
+      if (repository.includes("/")) {
+        blockedRepositories.add(repository);
+      }
+    }
+    cursor = page.cursor;
+  } while (cursor);
+
+  return blockedRepositories;
+}
+
 function normalizeRepository(repo: GitHubRepository): PluginListing | null {
   if (
     readBoolean(repo.disabled) ||
diff --git a/workers/plugin-marketplace/wrangler.toml b/workers/plugin-marketplace/wrangler.toml
index 55b2e069..d80c2bfb 100644
--- a/workers/plugin-marketplace/wrangler.toml
+++ b/workers/plugin-marketplace/wrangler.toml
@@ -7,5 +7,9 @@ workers_dev = false
 binding = "PLUGIN_MARKETPLACE_BUCKET"
 bucket_name = "herdr-plugin-marketplace"
 
+[[kv_namespaces]]
+binding = "PLUGIN_MARKETPLACE_BLACKLIST"
+id = "6504b3b84171492db56e805f6aad1686"
+
 [triggers]
 crons = ["*/30 * * * *"]