diff --git a/doc/api/net.md b/doc/api/net.md
index 0bc2adbd455b8b..dc03e5b95e6729 100644
--- a/doc/api/net.md
+++ b/doc/api/net.md
@@ -1461,6 +1461,45 @@ If `timeout` is 0, then the existing idle timeout is disabled.
 The optional `callback` parameter will be added as a one-time listener for the
 [`'timeout'`][] event.
 
+### `socket.getTypeOfService()`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+* Returns: {integer} The current TOS value.
+
+Returns the current Type of Service (TOS) field for IPv4 packets or Traffic
+Class for IPv6 packets for this socket.
+
+`setTypeOfService()` may be called before the socket is connected; the value
+will be cached and applied when the socket establishes a connection.
+`getTypeOfService()` will return the currently set value even before connection.
+
+On some platforms (e.g., Linux), certain TOS/ECN bits may be masked or ignored,
+and behavior can differ between IPv4 and IPv6 or dual-stack sockets. Callers
+should verify platform-specific semantics.
+
+### `socket.setTypeOfService(tos)`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+* `tos` {integer} The TOS value to set (0-255).
+* Returns: {net.Socket} The socket itself.
+
+Sets the Type of Service (TOS) field for IPv4 packets or Traffic Class for IPv6
+Packets sent from this socket. This can be used to prioritize network traffic.
+
+`setTypeOfService()` may be called before the socket is connected; the value
+will be cached and applied when the socket establishes a connection.
+`getTypeOfService()` will return the currently set value even before connection.
+
+On some platforms (e.g., Linux), certain TOS/ECN bits may be masked or ignored,
+and behavior can differ between IPv4 and IPv6 or dual-stack sockets. Callers
+should verify platform-specific semantics.
+
 ### `socket.timeout`
 
 <!-- YAML
diff --git a/lib/net.js b/lib/net.js
index a391e9da30f861..02a3c25ced43d4 100644
--- a/lib/net.js
+++ b/lib/net.js
@@ -57,6 +57,7 @@ const {
 const assert = require('internal/assert');
 const {
   UV_EADDRINUSE,
+  UV_EBADF,
   UV_EINVAL,
   UV_ENOTCONN,
   UV_ECANCELED,
@@ -358,6 +359,7 @@ const kBytesWritten = Symbol('kBytesWritten');
 const kSetNoDelay = Symbol('kSetNoDelay');
 const kSetKeepAlive = Symbol('kSetKeepAlive');
 const kSetKeepAliveInitialDelay = Symbol('kSetKeepAliveInitialDelay');
+const kSetTOS = Symbol('kSetTOS');
 
 function Socket(options) {
   if (!(this instanceof Socket)) return new Socket(options);
@@ -473,6 +475,10 @@ function Socket(options) {
   this[kSetNoDelay] = Boolean(options.noDelay);
   this[kSetKeepAlive] = Boolean(options.keepAlive);
   this[kSetKeepAliveInitialDelay] = ~~(options.keepAliveInitialDelay / 1000);
+  if (options.tos !== undefined) {
+    validateInt32(options.tos, 'options.tos', 0, 255);
+  }
+  this[kSetTOS] = options.tos;
 
   // Shut down the socket when we're finished with it.
   this.on('end', onReadableStreamEnd);
@@ -652,6 +658,52 @@ Socket.prototype.setKeepAlive = function(enable, initialDelayMsecs) {
 };
 
 
+Socket.prototype.setTypeOfService = function(tos) {
+  if (NumberIsNaN(tos)) {
+    throw new ERR_INVALID_ARG_TYPE('tos', 'number', tos);
+  }
+  validateInt32(tos, 'tos', 0, 255);
+
+  if (!this._handle) {
+    this[kSetTOS] = tos;
+    return this;
+  }
+
+  if (!this._handle.setTypeOfService) {
+    this[kSetTOS] = tos;
+    return this;
+  }
+
+  if (tos !== this[kSetTOS]) {
+    this[kSetTOS] = tos;
+    const err = this._handle.setTypeOfService(tos);
+    if (err) {
+      throw new ErrnoException(err, 'setTypeOfService');
+    }
+  }
+
+  return this;
+};
+
+
+Socket.prototype.getTypeOfService = function() {
+  if (!this._handle) {
+    // Return cached value if set, otherwise default to 0
+    return this[kSetTOS] !== undefined ? this[kSetTOS] : 0;
+  }
+
+  if (!this._handle.getTypeOfService) {
+    return this[kSetTOS] !== undefined ? this[kSetTOS] : 0;
+  }
+
+  const res = this._handle.getTypeOfService();
+  if (typeof res === 'number' && res < 0) {
+    throw new ErrnoException(res, 'getTypeOfService');
+  }
+  return res;
+};
+
+
 Socket.prototype.address = function() {
   return this._getsockname();
 };
@@ -1619,6 +1671,13 @@ function afterConnect(status, handle, req, readable, writable) {
       self._handle.setKeepAlive(true, self[kSetKeepAliveInitialDelay]);
     }
 
+    if (self[kSetTOS] !== undefined && self._handle.setTypeOfService) {
+      const err = self._handle.setTypeOfService(self[kSetTOS]);
+      if (err && err !== UV_EBADF) {
+        self.emit('error', new ErrnoException(err, 'setTypeOfService'));
+      }
+    }
+
     self.emit('connect');
     self.emit('ready');
 
diff --git a/src/tcp_wrap.cc b/src/tcp_wrap.cc
index b2507f6dfbea1b..306db3ffe53f8f 100644
--- a/src/tcp_wrap.cc
+++ b/src/tcp_wrap.cc
@@ -20,7 +20,10 @@
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include "tcp_wrap.h"
-
+#ifdef _WIN32
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#endif
 #include "connect_wrap.h"
 #include "connection_wrap.h"
 #include "env-inl.h"
@@ -32,9 +35,15 @@
 #include "stream_base-inl.h"
 #include "stream_wrap.h"
 #include "util-inl.h"
-
+#include <cerrno>
 #include <cstdlib>
 
+#ifndef _WIN32
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <netinet/ip6.h>
+#include <sys/socket.h>
+#endif
 
 namespace node {
 
@@ -106,6 +115,8 @@ void TCPWrap::Initialize(Local<Object> target,
                  GetSockOrPeerName<TCPWrap, uv_tcp_getpeername>);
   SetProtoMethod(isolate, t, "setNoDelay", SetNoDelay);
   SetProtoMethod(isolate, t, "setKeepAlive", SetKeepAlive);
+  SetProtoMethod(isolate, t, "setTypeOfService", SetTOS);
+  SetProtoMethod(isolate, t, "getTypeOfService", GetTOS);
   SetProtoMethod(isolate, t, "reset", Reset);
 
 #ifdef _WIN32
@@ -145,6 +156,8 @@ void TCPWrap::RegisterExternalReferences(ExternalReferenceRegistry* registry) {
   registry->Register(GetSockOrPeerName<TCPWrap, uv_tcp_getpeername>);
   registry->Register(SetNoDelay);
   registry->Register(SetKeepAlive);
+  registry->Register(SetTOS);
+  registry->Register(GetTOS);
   registry->Register(Reset);
 #ifdef _WIN32
   registry->Register(SetSimultaneousAccepts);
@@ -208,6 +221,135 @@ void TCPWrap::SetKeepAlive(const FunctionCallbackInfo<Value>& args) {
   args.GetReturnValue().Set(err);
 }
 
+void TCPWrap::SetTOS(const FunctionCallbackInfo<Value>& args) {
+  TCPWrap* wrap;
+  ASSIGN_OR_RETURN_UNWRAP(
+      &wrap, args.This(), args.GetReturnValue().Set(UV_EBADF));
+  Environment* env = wrap->env();
+
+  int tos = 0;
+  if (!args[0]->Int32Value(env->context()).To(&tos)) return;
+
+  uv_os_fd_t fd;
+  int err = uv_fileno(reinterpret_cast<uv_handle_t*>(&wrap->handle_), &fd);
+  if (err != 0) {
+    args.GetReturnValue().Set(err);
+    return;
+  }
+
+  // 1. Detect the socket family (IPv4 vs IPv6)
+  sockaddr_storage storage;
+  int addrlen = sizeof(storage);
+  int sock_err = uv_tcp_getsockname(&wrap->handle_,
+                                    reinterpret_cast<sockaddr*>(&storage),
+                                    &addrlen);
+
+  // If we can't determine the family (e.g. closed socket), fail gracefully.
+  if (sock_err != 0) {
+    args.GetReturnValue().Set(sock_err);
+    return;
+  }
+
+  // 2. Select the correct protocol level and option name
+  int level;
+  int option;
+
+  if (storage.ss_family == AF_INET) {
+    level = IPPROTO_IP;
+    option = IP_TOS;
+  } else if (storage.ss_family == AF_INET6) {
+    level = IPPROTO_IPV6;
+    option = IPV6_TCLASS;
+  } else {
+    // Unsupported socket family (e.g. AF_UNIX)
+    args.GetReturnValue().Set(UV_EINVAL);
+    return;
+  }
+
+  // 3. Perform the system call (Platform specific casting)
+#ifdef _WIN32
+  if (setsockopt(reinterpret_cast<SOCKET>(fd),
+                 level,
+                 option,
+                 reinterpret_cast<const char*>(&tos),
+                 static_cast<int>(sizeof(tos))) == 0) {
+    args.GetReturnValue().Set(0);
+  } else {
+    args.GetReturnValue().Set(uv_translate_sys_error(WSAGetLastError()));
+  }
+#else
+  if (setsockopt(fd, level, option, &tos, sizeof(tos)) == 0) {
+    args.GetReturnValue().Set(0);
+  } else {
+    args.GetReturnValue().Set(uv_translate_sys_error(errno));
+  }
+#endif
+}
+
+void TCPWrap::GetTOS(const FunctionCallbackInfo<Value>& args) {
+  TCPWrap* wrap;
+  ASSIGN_OR_RETURN_UNWRAP(
+      &wrap, args.This(), args.GetReturnValue().Set(UV_EBADF));
+
+  uv_os_fd_t fd;
+  int err = uv_fileno(reinterpret_cast<uv_handle_t*>(&wrap->handle_), &fd);
+  if (err != 0) {
+    args.GetReturnValue().Set(err);
+    return;
+  }
+
+  // Detect socket family explicitly
+  sockaddr_storage storage;
+  int addrlen = sizeof(storage);
+  int sock_err = uv_tcp_getsockname(&wrap->handle_,
+                                    reinterpret_cast<sockaddr*>(&storage),
+                                    &addrlen);
+
+  int level;
+  int option;
+
+  // Select the correct constant based on family
+  if (sock_err == 0) {
+    if (storage.ss_family == AF_INET) {
+      level = IPPROTO_IP;
+      option = IP_TOS;
+    } else if (storage.ss_family == AF_INET6) {
+      level = IPPROTO_IPV6;
+      option = IPV6_TCLASS;
+    } else {
+      // Unknown or unsupported family
+      args.GetReturnValue().Set(UV_EINVAL);
+      return;
+    }
+  } else {
+    // If we can't determine the family, we can't safely get the TOS
+    args.GetReturnValue().Set(sock_err);
+    return;
+  }
+
+  int tos = 0;
+
+  // Perform the system call with platform-specific casting
+#ifdef _WIN32
+  int len = sizeof(tos);
+  if (getsockopt(reinterpret_cast<SOCKET>(fd),
+                 level,
+                 option,
+                 reinterpret_cast<char*>(&tos),
+                 &len) == 0) {
+    args.GetReturnValue().Set(tos);
+  } else {
+    args.GetReturnValue().Set(uv_translate_sys_error(WSAGetLastError()));
+  }
+#else
+  socklen_t len = sizeof(tos);
+  if (getsockopt(fd, level, option, &tos, &len) == 0) {
+    args.GetReturnValue().Set(tos);
+  } else {
+    args.GetReturnValue().Set(uv_translate_sys_error(errno));
+  }
+#endif
+}
 
 #ifdef _WIN32
 void TCPWrap::SetSimultaneousAccepts(const FunctionCallbackInfo<Value>& args) {
diff --git a/src/tcp_wrap.h b/src/tcp_wrap.h
index a4684b65d24934..56e2a42d5fd3b7 100644
--- a/src/tcp_wrap.h
+++ b/src/tcp_wrap.h
@@ -74,6 +74,8 @@ class TCPWrap : public ConnectionWrap<TCPWrap, uv_tcp_t> {
   static void New(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void SetNoDelay(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void SetKeepAlive(const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void SetTOS(const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void GetTOS(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Bind(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Bind6(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Listen(const v8::FunctionCallbackInfo<v8::Value>& args);
diff --git a/test/parallel/test-net-socket-tos.js b/test/parallel/test-net-socket-tos.js
new file mode 100644
index 00000000000000..3bf686bfc3eda7
--- /dev/null
+++ b/test/parallel/test-net-socket-tos.js
@@ -0,0 +1,91 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const net = require('net');
+
+const server = net.createServer(
+  common.mustCall((socket) => {
+    socket.end();
+  }),
+);
+
+server.listen(
+  0,
+  common.mustCall(() => {
+    const port = server.address().port;
+    const client = new net.Socket();
+
+    // Set TOS before connection to test caching behavior
+    client.setTypeOfService(0x10);
+    client.connect(port);
+
+    client.on(
+      'connect',
+      common.mustCall(() => {
+        // TEST 1: setTypeOfService validation
+        // Should throw if value is not a number, is NaN, or is out of range (0-255)
+        assert.throws(() => client.setTypeOfService('invalid'), {
+          code: 'ERR_INVALID_ARG_TYPE',
+        });
+        assert.throws(() => client.setTypeOfService(NaN), {
+          code: 'ERR_INVALID_ARG_TYPE',
+        });
+        assert.throws(() => client.setTypeOfService(256), {
+          code: 'ERR_OUT_OF_RANGE',
+        });
+        assert.throws(() => client.setTypeOfService(-1), {
+          code: 'ERR_OUT_OF_RANGE',
+        });
+
+        // TEST 2a: Verify deferred application
+        // Check if the TOS value set before connect() was cached and applied.
+        // We mask with 0xFC to check only the high 6 bits (DSCP),
+        // ignoring the lowest 2 bits (ECN) which the OS may modify or zero out.
+        const mask = 0xFC;
+        const preConnectGot = client.getTypeOfService();
+        assert.strictEqual(
+          preConnectGot & mask,
+          0x10 & mask,
+          `Pre-connect TOS should be ${0x10 & mask}, got ${preConnectGot & mask}`,
+        );
+
+        // TEST 2b: Setting and getting TOS on an active connection
+        const tosValue = 0x10; // IPTOS_LOWDELAY (16)
+
+        // On all platforms, this should succeed (tries both IPv4 and IPv6)
+        client.setTypeOfService(tosValue);
+
+        // Verify values
+        const got = client.getTypeOfService();
+
+        // Compare only the DSCP bits (7-2) using the mask defined above
+        assert.strictEqual(
+          got & mask,
+          tosValue & mask,
+          `Expected TOS ${tosValue & mask}, got ${got & mask}`,
+        );
+
+        // TEST 3: Boundary values
+        // Check min (0x00), max (0xFF), and arbitrary intermediate values
+        for (const boundaryValue of [0x00, 0xFF, 0x3F]) {
+          client.setTypeOfService(boundaryValue);
+          const gotBoundary = client.getTypeOfService();
+          assert.strictEqual(
+            gotBoundary & mask,
+            boundaryValue & mask,
+            `Expected TOS ${boundaryValue & mask}, got ${gotBoundary & mask}`,
+          );
+        }
+
+        client.end();
+      }),
+    );
+
+    client.on(
+      'end',
+      common.mustCall(() => {
+        server.close();
+      }),
+    );
+  }),
+);