diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index b12a5eb5a..ddbb2a18c 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -39,6 +39,7 @@ updates:
       - "/packages/modules/nats"
       - "/packages/modules/neo4j"
       - "/packages/modules/ollama"
+      - "/packages/modules/opensearch"
       - "/packages/modules/postgresql"
       - "/packages/modules/qdrant"
       - "/packages/modules/rabbitmq"
diff --git a/docs/modules/opensearch.md b/docs/modules/opensearch.md
new file mode 100644
index 000000000..57dd64ac3
--- /dev/null
+++ b/docs/modules/opensearch.md
@@ -0,0 +1,23 @@
+# OpenSearch Module
+
+[OpenSearch](https://opensearch.org/) is a community-driven, open source search and analytics suite derived from Elasticsearch. It provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents.
+
+## Install
+
+```bash
+npm install @testcontainers/opensearch --save-dev
+```
+
+## Examples
+
+<!--codeinclude-->
+[Create an index:](../../packages/modules/opensearch/src/opensearch-container.test.ts) inside_block:createIndex
+<!--/codeinclude-->
+
+<!--codeinclude-->
+[Index a document:](../../packages/modules/opensearch/src/opensearch-container.test.ts) inside_block:indexDocument
+<!--/codeinclude-->
+
+<!--codeinclude-->
+[Set a custom password:](../../packages/modules/opensearch/src/opensearch-container.test.ts) inside_block:customPassword
+<!--/codeinclude-->
diff --git a/mkdocs.yml b/mkdocs.yml
index 230cde8d6..fcbfbfa88 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -74,6 +74,7 @@ nav:
       - Nats: modules/nats.md
       - Neo4J: modules/neo4j.md
       - Ollama: modules/ollama.md
+      - OpenSearch: modules/opensearch.md
       - PostgreSQL: modules/postgresql.md
       - Qdrant: modules/qdrant.md
       - RabbitMQ: modules/rabbitmq.md
diff --git a/package-lock.json b/package-lock.json
index c18943564..668f09786 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5633,6 +5633,32 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@opensearch-project/opensearch": {
+      "version": "3.5.1",
+      "resolved": "https://registry.npmjs.org/@opensearch-project/opensearch/-/opensearch-3.5.1.tgz",
+      "integrity": "sha512-6bf+HcuERzAtHZxrm6phjref54ABse39BpkDie/YO3AUFMCBrb3SK5okKSdT5n3+nDRuEEQLhQCl0RQV3s1qpA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "aws4": "^1.11.0",
+        "debug": "^4.3.1",
+        "hpagent": "^1.2.0",
+        "json11": "^2.0.0",
+        "ms": "^2.1.3",
+        "secure-json-parse": "^2.4.0"
+      },
+      "engines": {
+        "node": ">=14",
+        "yarn": "^1.22.10"
+      }
+    },
+    "node_modules/@opensearch-project/opensearch/node_modules/secure-json-parse": {
+      "version": "2.7.0",
+      "resolved": "https://registry.npmjs.org/secure-json-parse/-/secure-json-parse-2.7.0.tgz",
+      "integrity": "sha512-6aU+Rwsezw7VR8/nyvKTx8QpWH9FrcYiXXlqC4z5d5XQBDRqtbfsRjnwGyqbi3gddNtWHuEk9OANUotL26qKUw==",
+      "dev": true,
+      "license": "BSD-3-Clause"
+    },
     "node_modules/@opentelemetry/api": {
       "version": "1.9.0",
       "resolved": "https://registry.npmjs.org/@opentelemetry/api/-/api-1.9.0.tgz",
@@ -7142,6 +7168,10 @@
       "resolved": "packages/modules/ollama",
       "link": true
     },
+    "node_modules/@testcontainers/opensearch": {
+      "resolved": "packages/modules/opensearch",
+      "link": true
+    },
     "node_modules/@testcontainers/postgresql": {
       "resolved": "packages/modules/postgresql",
       "link": true
@@ -7763,6 +7793,13 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/zxcvbn": {
+      "version": "4.4.5",
+      "resolved": "https://registry.npmjs.org/@types/zxcvbn/-/zxcvbn-4.4.5.tgz",
+      "integrity": "sha512-FZJgC5Bxuqg7Rhsm/bx6gAruHHhDQ55r+s0JhDh8CQ16fD7NsJJ+p8YMMQDhSQoIrSmjpqqYWA96oQVMNkjRyA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@typescript-eslint/eslint-plugin": {
       "version": "8.35.1",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.35.1.tgz",
@@ -8924,6 +8961,13 @@
         "node": ">= 6.0.0"
       }
     },
+    "node_modules/aws4": {
+      "version": "1.13.2",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.13.2.tgz",
+      "integrity": "sha512-lHe62zvbTB5eEABUVi/AwVh0ZKY9rMMDhmm+eeyuuUQbQ3+J+fONVQOZyj+DdrvD4BY33uYniyRJ4UJIaSKAfw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/axios": {
       "version": "1.8.2",
       "resolved": "https://registry.npmjs.org/axios/-/axios-1.8.2.tgz",
@@ -13714,6 +13758,16 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/json11": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/json11/-/json11-2.0.2.tgz",
+      "integrity": "sha512-HIrd50UPYmP6sqLuLbFVm75g16o0oZrVfxrsY0EEys22klz8mRoWlX9KAEDOSOR9Q34rcxsyC8oDveGrCz5uLQ==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "json11": "dist/cli.mjs"
+      }
+    },
     "node_modules/jsonfile": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-6.1.0.tgz",
@@ -21157,6 +21211,12 @@
         "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
       }
     },
+    "node_modules/zxcvbn": {
+      "version": "4.4.2",
+      "resolved": "https://registry.npmjs.org/zxcvbn/-/zxcvbn-4.4.2.tgz",
+      "integrity": "sha512-Bq0B+ixT/DMyG8kgX2xWcI5jUvCwqrMxSFam7m0lAf78nf04hv6lNCsyLYdyYTrCVMqNDY/206K7eExYCeSyUQ==",
+      "license": "MIT"
+    },
     "packages/modules/arangodb": {
       "name": "@testcontainers/arangodb",
       "version": "11.2.1",
@@ -21594,6 +21654,19 @@
         "testcontainers": "^11.2.1"
       }
     },
+    "packages/modules/opensearch": {
+      "name": "@testcontainers/opensearch",
+      "version": "11.2.1",
+      "license": "MIT",
+      "dependencies": {
+        "testcontainers": "^11.2.1",
+        "zxcvbn": "^4.4.2"
+      },
+      "devDependencies": {
+        "@opensearch-project/opensearch": "^3.5.1",
+        "@types/zxcvbn": "^4.4.5"
+      }
+    },
     "packages/modules/postgresql": {
       "name": "@testcontainers/postgresql",
       "version": "11.2.1",
diff --git a/packages/modules/opensearch/Dockerfile b/packages/modules/opensearch/Dockerfile
new file mode 100644
index 000000000..2835a9cd8
--- /dev/null
+++ b/packages/modules/opensearch/Dockerfile
@@ -0,0 +1 @@
+FROM opensearchproject/opensearch:3.1.0
\ No newline at end of file
diff --git a/packages/modules/opensearch/package.json b/packages/modules/opensearch/package.json
new file mode 100644
index 000000000..38430c0a1
--- /dev/null
+++ b/packages/modules/opensearch/package.json
@@ -0,0 +1,39 @@
+{
+  "name": "@testcontainers/opensearch",
+  "version": "11.2.1",
+  "license": "MIT",
+  "keywords": [
+    "opensearch",
+    "testing",
+    "docker",
+    "testcontainers"
+  ],
+  "description": "OpenSearch module for Testcontainers",
+  "homepage": "https://github.com/testcontainers/testcontainers-node#readme",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/testcontainers/testcontainers-node.git"
+  },
+  "bugs": {
+    "url": "https://github.com/testcontainers/testcontainers-node/issues"
+  },
+  "main": "build/index.js",
+  "files": [
+    "build"
+  ],
+  "publishConfig": {
+    "access": "public"
+  },
+  "scripts": {
+    "prepack": "shx cp ../../../README.md . && shx cp ../../../LICENSE .",
+    "build": "tsc --project tsconfig.build.json"
+  },
+  "devDependencies": {
+    "@opensearch-project/opensearch": "^3.5.1",
+    "@types/zxcvbn": "^4.4.5"
+  },
+  "dependencies": {
+    "testcontainers": "^11.2.1",
+    "zxcvbn": "^4.4.2"
+  }
+}
diff --git a/packages/modules/opensearch/src/index.ts b/packages/modules/opensearch/src/index.ts
new file mode 100644
index 000000000..85027621c
--- /dev/null
+++ b/packages/modules/opensearch/src/index.ts
@@ -0,0 +1 @@
+export { OpenSearchContainer, StartedOpenSearchContainer } from "./opensearch-container";
diff --git a/packages/modules/opensearch/src/opensearch-container.test.ts b/packages/modules/opensearch/src/opensearch-container.test.ts
new file mode 100644
index 000000000..3c3eb85fd
--- /dev/null
+++ b/packages/modules/opensearch/src/opensearch-container.test.ts
@@ -0,0 +1,105 @@
+import { Client } from "@opensearch-project/opensearch";
+import { getImage } from "../../../testcontainers/src/utils/test-helper";
+import { OpenSearchContainer } from "./opensearch-container";
+
+const IMAGE = getImage(__dirname);
+const images = ["opensearchproject/opensearch:2.19.2", IMAGE];
+
+describe("OpenSearchContainer", { timeout: 180_000 }, () => {
+  // createIndex {
+  it.each(images)("should create an index with %s", async (image) => {
+    const container = await new OpenSearchContainer(image).start();
+    const client = new Client({
+      node: container.getHttpUrl(),
+      auth: {
+        username: container.getUsername(),
+        password: container.getPassword(),
+      },
+      ssl: {
+        // trust the self-signed cert
+        rejectUnauthorized: false,
+      },
+    });
+
+    await client.indices.create({ index: "people" });
+    const existsResponse = await client.indices.exists({ index: "people" });
+    expect(existsResponse.body).toBe(true);
+    await container.stop();
+  });
+  // }
+
+  // indexDocument {
+  it("should index a document", async () => {
+    const container = await new OpenSearchContainer(IMAGE).start();
+    const client = new Client({
+      node: container.getHttpUrl(),
+      auth: {
+        username: container.getUsername(),
+        password: container.getPassword(),
+      },
+      ssl: {
+        rejectUnauthorized: false,
+      },
+    });
+
+    const document = { id: "1", name: "John Doe" };
+
+    await client.index({
+      index: "people",
+      id: document.id,
+      body: document,
+    });
+
+    const getResponse = await client.get({ index: "people", id: document.id });
+    expect(getResponse.body._source).toStrictEqual(document);
+    await container.stop();
+  });
+  // }
+
+  it("should work with restarted container", async () => {
+    const container = await new OpenSearchContainer(IMAGE).start();
+    await container.restart();
+
+    const client = new Client({
+      node: container.getHttpUrl(),
+      auth: {
+        username: container.getUsername(),
+        password: container.getPassword(),
+      },
+      ssl: {
+        rejectUnauthorized: false,
+      },
+    });
+
+    await client.indices.create({ index: "people" });
+    const existsResponse = await client.indices.exists({ index: "people" });
+    expect(existsResponse.body).toBe(true);
+    await container.stop();
+  });
+
+  it("should throw when given an invalid password", () => {
+    expect(() => new OpenSearchContainer(IMAGE).withPassword("weakpwd")).toThrowError(/Password "weakpwd" is too weak/);
+  });
+
+  // customPassword {
+  it("should set custom password", async () => {
+    const container = await new OpenSearchContainer(IMAGE).withPassword("Str0ng!Passw0rd2025").start();
+
+    const client = new Client({
+      node: container.getHttpUrl(),
+      auth: {
+        username: container.getUsername(),
+        password: container.getPassword(),
+      },
+      ssl: {
+        rejectUnauthorized: false,
+      },
+    });
+
+    await client.indices.create({ index: "people" });
+    const existsResponse = await client.indices.exists({ index: "people" });
+    expect(existsResponse.body).toBe(true);
+    await container.stop();
+  });
+  // }
+});
diff --git a/packages/modules/opensearch/src/opensearch-container.ts b/packages/modules/opensearch/src/opensearch-container.ts
new file mode 100644
index 000000000..28327c7d8
--- /dev/null
+++ b/packages/modules/opensearch/src/opensearch-container.ts
@@ -0,0 +1,103 @@
+import { AbstractStartedContainer, GenericContainer, StartedTestContainer, Wait } from "testcontainers";
+import zxcvbn from "zxcvbn";
+
+const OPENSEARCH_HTTP_PORT = 9200;
+const OPENSEARCH_TRANSPORT_PORT = 9300;
+const OPENSEARCH_PERFORMANCE_ANALYZER_PORT = 9600;
+
+export class OpenSearchContainer extends GenericContainer {
+  // default to security on, with a strong demo password
+  private securityEnabled = true;
+  private password = "yourStrong(!)P@ssw0rd";
+  private readonly username = "admin";
+
+  // HTTPS + Basic Auth wait strategy
+  private readonly defaultWaitStrategy = Wait.forHttp("/", OPENSEARCH_HTTP_PORT)
+    .usingTls()
+    .allowInsecure()
+    .withBasicCredentials(this.username, this.password);
+
+  constructor(image: string) {
+    super(image);
+
+    this.withExposedPorts(OPENSEARCH_HTTP_PORT, OPENSEARCH_TRANSPORT_PORT, OPENSEARCH_PERFORMANCE_ANALYZER_PORT)
+      .withEnvironment({
+        "discovery.type": "single-node",
+        // disable security plugin if requested
+        "plugins.security.disabled": (!this.securityEnabled).toString(),
+      })
+      .withWaitStrategy(this.defaultWaitStrategy)
+      .withStartupTimeout(120_000);
+  }
+
+  /**
+   * Toggle OpenSearch security plugin on/off.
+   */
+  public withSecurityEnabled(enabled: boolean): this {
+    this.securityEnabled = enabled;
+    this.withEnvironment({
+      "plugins.security.disabled": (!enabled).toString(),
+    });
+    return this;
+  }
+
+  /**
+   * Override the 'admin' password.
+   * Enforces OpenSearch’s requirement of zxcvbn score ≥ 3
+   */
+  public withPassword(password: string): this {
+    const { score } = zxcvbn(password);
+    if (score < 3) {
+      throw new Error(
+        `Password "${password}" is too weak (zxcvbn score ${score}). Must score ≥ 3 to meet OpenSearch security requirements.`
+      );
+    }
+
+    this.password = password;
+    this.defaultWaitStrategy.withBasicCredentials(this.username, this.password);
+    return this;
+  }
+
+  /**
+   * Start the container, injecting the initial-admin-password env var,
+   * then wrap in our typed StartedOpenSearchContainer.
+   */
+  public override async start(): Promise<StartedOpenSearchContainer> {
+    this.withEnvironment({
+      OPENSEARCH_INITIAL_ADMIN_PASSWORD: this.password,
+    });
+
+    const started = await super.start();
+    return new StartedOpenSearchContainer(started, this.username, this.password);
+  }
+}
+
+export class StartedOpenSearchContainer extends AbstractStartedContainer {
+  constructor(
+    override readonly startedTestContainer: StartedTestContainer,
+    private readonly username: string,
+    private readonly password: string
+  ) {
+    super(startedTestContainer);
+  }
+
+  /** Mapped HTTP(S) port */
+  public getPort(): number {
+    return this.getMappedPort(OPENSEARCH_HTTP_PORT);
+  }
+
+  /** HTTPS endpoint URL */
+  public getHttpUrl(): string {
+    return `https://${this.getHost()}:${this.getPort()}`;
+  }
+
+  /** Admin username (always 'admin' by default) */
+  public getUsername(): string {
+    return this.username;
+  }
+
+  /** Admin password */
+  public getPassword(): string {
+    return this.password;
+  }
+}
diff --git a/packages/modules/opensearch/tsconfig.build.json b/packages/modules/opensearch/tsconfig.build.json
new file mode 100644
index 000000000..6b7cddfa0
--- /dev/null
+++ b/packages/modules/opensearch/tsconfig.build.json
@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.json",
+  "exclude": ["build", "src/**/*.test.ts"],
+  "references": [
+    { "path": "../../testcontainers" }
+  ]
+}
diff --git a/packages/modules/opensearch/tsconfig.json b/packages/modules/opensearch/tsconfig.json
new file mode 100644
index 000000000..75a90f749
--- /dev/null
+++ b/packages/modules/opensearch/tsconfig.json
@@ -0,0 +1,14 @@
+{
+  "extends": "../../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "build",
+    "paths": {
+      "testcontainers": ["../../testcontainers/src"]
+    }
+  },
+  "exclude": ["build"],
+  "references": [
+    { "path": "../../testcontainers" }
+  ]
+}