diff --git a/mem0-ts/src/oss/src/vector_stores/qdrant.ts b/mem0-ts/src/oss/src/vector_stores/qdrant.ts
index 699760465..81c6faea8 100644
--- a/mem0-ts/src/oss/src/vector_stores/qdrant.ts
+++ b/mem0-ts/src/oss/src/vector_stores/qdrant.ts
@@ -4,6 +4,20 @@ import { SearchFilters, VectorStoreConfig, VectorStoreResult } from "../types";
 import * as fs from "fs";
 
 interface QdrantConfig extends VectorStoreConfig {
+  /**
+   * Pre-configured QdrantClient instance. If using Qdrant Cloud, you must pass
+   * `port` explicitly when constructing the client to avoid "Illegal host" errors
+   * caused by a known upstream bug (qdrant/qdrant-js#59).
+   *
+   * @example
+   * ```typescript
+   * const client = new QdrantClient({
+   *   url: "https://xxx.cloud.qdrant.io:6333",
+   *   port: 6333,
+   *   apiKey: "xxx",
+   * });
+   * ```
+   */
   client?: QdrantClient;
   host?: string;
   port?: number;
@@ -44,6 +58,13 @@ export class Qdrant implements VectorStore {
       }
       if (config.url) {
         params.url = config.url;
+        // Workaround for qdrant/qdrant-js#59: explicitly pass port to avoid "Illegal host" error
+        try {
+          const parsedUrl = new URL(config.url);
+          params.port = parsedUrl.port ? parseInt(parsedUrl.port, 10) : 6333;
+        } catch (_) {
+          params.port = 6333;
+        }
       }
       if (config.host && config.port) {
         params.host = config.host;
diff --git a/mem0-ts/src/oss/tests/qdrant-url-port.test.ts b/mem0-ts/src/oss/tests/qdrant-url-port.test.ts
new file mode 100644
index 000000000..ae86ea471
--- /dev/null
+++ b/mem0-ts/src/oss/tests/qdrant-url-port.test.ts
@@ -0,0 +1,170 @@
+/// <reference types="jest" />
+/**
+ * Tests for Qdrant Cloud URL port extraction workaround (qdrant/qdrant-js#59).
+ *
+ * Verifies that when a `url` config is provided, the port is extracted and
+ * passed explicitly to QdrantClient to avoid "Illegal host" errors.
+ */
+
+jest.setTimeout(15000);
+
+let capturedParams: Record<string, any> | undefined;
+
+// Mock QdrantClient to capture constructor params
+jest.mock("@qdrant/js-client-rest", () => {
+  return {
+    QdrantClient: jest.fn().mockImplementation((params: any) => {
+      capturedParams = params;
+      // Return a mock client that satisfies initialize()
+      return {
+        createCollection: jest.fn().mockResolvedValue(undefined),
+        getCollection: jest.fn().mockResolvedValue({
+          config: { params: { vectors: { size: 768 } } },
+        }),
+        scroll: jest.fn().mockResolvedValue({ points: [] }),
+        upsert: jest.fn().mockResolvedValue(undefined),
+        retrieve: jest.fn().mockResolvedValue([]),
+        search: jest.fn().mockResolvedValue([]),
+        delete: jest.fn().mockResolvedValue(undefined),
+        deleteCollection: jest.fn().mockResolvedValue(undefined),
+      };
+    }),
+  };
+});
+
+import { Qdrant } from "../src/vector_stores/qdrant";
+
+beforeEach(() => {
+  capturedParams = undefined;
+  (require("@qdrant/js-client-rest").QdrantClient as jest.Mock).mockClear();
+});
+
+describe("Qdrant URL port extraction (qdrant/qdrant-js#59 workaround)", () => {
+  it("extracts port from HTTPS URL with explicit port", () => {
+    new Qdrant({
+      url: "https://my-cluster.us-west-1-0.aws.cloud.qdrant.io:6333",
+      apiKey: "test-key",
+      collectionName: "test",
+      embeddingModelDims: 768,
+      dimension: 768,
+    });
+
+    expect(capturedParams).toBeDefined();
+    expect(capturedParams!.url).toBe(
+      "https://my-cluster.us-west-1-0.aws.cloud.qdrant.io:6333",
+    );
+    expect(capturedParams!.port).toBe(6333);
+    expect(capturedParams!.apiKey).toBe("test-key");
+  });
+
+  it("extracts port from HTTP URL with explicit port", () => {
+    new Qdrant({
+      url: "http://localhost:6333",
+      collectionName: "test",
+      embeddingModelDims: 768,
+      dimension: 768,
+    });
+
+    expect(capturedParams).toBeDefined();
+    expect(capturedParams!.url).toBe("http://localhost:6333");
+    expect(capturedParams!.port).toBe(6333);
+  });
+
+  it("defaults to port 6333 when HTTPS URL has no explicit port", () => {
+    new Qdrant({
+      url: "https://my-cluster.cloud.qdrant.io",
+      apiKey: "test-key",
+      collectionName: "test",
+      embeddingModelDims: 768,
+      dimension: 768,
+    });
+
+    expect(capturedParams).toBeDefined();
+    expect(capturedParams!.url).toBe("https://my-cluster.cloud.qdrant.io");
+    expect(capturedParams!.port).toBe(6333);
+  });
+
+  it("defaults to port 6333 when HTTP URL has no explicit port", () => {
+    new Qdrant({
+      url: "http://localhost",
+      collectionName: "test",
+      embeddingModelDims: 768,
+      dimension: 768,
+    });
+
+    expect(capturedParams).toBeDefined();
+    expect(capturedParams!.port).toBe(6333);
+  });
+
+  it("host+port config overrides URL-extracted port", () => {
+    new Qdrant({
+      url: "https://my-cluster.cloud.qdrant.io:6333",
+      host: "custom-host",
+      port: 9999,
+      apiKey: "test-key",
+      collectionName: "test",
+      embeddingModelDims: 768,
+      dimension: 768,
+    });
+
+    expect(capturedParams).toBeDefined();
+    expect(capturedParams!.host).toBe("custom-host");
+    expect(capturedParams!.port).toBe(9999);
+  });
+
+  it("handles invalid URL gracefully without crashing", () => {
+    expect(() => {
+      new Qdrant({
+        url: "not-a-valid-url",
+        collectionName: "test",
+        embeddingModelDims: 768,
+        dimension: 768,
+      });
+    }).not.toThrow();
+
+    expect(capturedParams).toBeDefined();
+    expect(capturedParams!.url).toBe("not-a-valid-url");
+    expect(capturedParams!.port).toBe(6333);
+  });
+
+  it("does not pass port when using pre-configured client", () => {
+    const mockClient: any = {
+      createCollection: jest.fn().mockResolvedValue(undefined),
+      getCollection: jest.fn().mockResolvedValue({
+        config: { params: { vectors: { size: 768 } } },
+      }),
+      scroll: jest.fn().mockResolvedValue({ points: [] }),
+      upsert: jest.fn().mockResolvedValue(undefined),
+      retrieve: jest.fn().mockResolvedValue([]),
+      search: jest.fn().mockResolvedValue([]),
+      delete: jest.fn().mockResolvedValue(undefined),
+      deleteCollection: jest.fn().mockResolvedValue(undefined),
+    };
+
+    new Qdrant({
+      client: mockClient,
+      collectionName: "test",
+      embeddingModelDims: 768,
+      dimension: 768,
+    });
+
+    // QdrantClient constructor should NOT have been called
+    expect(
+      require("@qdrant/js-client-rest").QdrantClient,
+    ).not.toHaveBeenCalled();
+  });
+
+  it("defaults to 6333 when HTTPS URL uses default port 443", () => {
+    new Qdrant({
+      url: "https://my-cluster.cloud.qdrant.io:443",
+      apiKey: "test-key",
+      collectionName: "test",
+      embeddingModelDims: 768,
+      dimension: 768,
+    });
+
+    // 443 is default for HTTPS, so URL.port returns empty string — we default to 6333
+    expect(capturedParams).toBeDefined();
+    expect(capturedParams!.port).toBe(6333);
+  });
+});