diff --git a/lib/internal/cli_table.js b/lib/internal/cli_table.js
index 853f02797fce41..2a5f0acd471909 100644
--- a/lib/internal/cli_table.js
+++ b/lib/internal/cli_table.js
@@ -11,8 +11,7 @@ const { getStringWidth } = require('internal/util/inspect');
 // The use of Unicode characters below is the only non-comment use of non-ASCII
 // Unicode characters in Node.js built-in modules. If they are ever removed or
 // rewritten with \u escapes, then a test will need to be (re-)added to Node.js
-// core to verify that Unicode characters work in built-ins. Otherwise,
-// consumers using Unicode in _third_party_main.js will run into problems.
+// core to verify that Unicode characters work in built-ins.
 // Refs: https://github.com/nodejs/node/issues/10673
 const tableChars = {
   /* eslint-disable node-core/non-ascii-character */
diff --git a/lib/internal/main/run_third_party_main.js b/lib/internal/main/run_third_party_main.js
deleted file mode 100644
index 5fb1d39bc6d072..00000000000000
--- a/lib/internal/main/run_third_party_main.js
+++ /dev/null
@@ -1,13 +0,0 @@
-'use strict';
-
-const {
-  prepareMainThreadExecution
-} = require('internal/bootstrap/pre_execution');
-
-prepareMainThreadExecution();
-markBootstrapComplete();
-
-// Legacy _third_party_main.js support
-process.nextTick(() => {
-  require('_third_party_main');
-});
diff --git a/node.gyp b/node.gyp
index cc9c52cef48edc..7331f127f22c28 100644
--- a/node.gyp
+++ b/node.gyp
@@ -162,7 +162,6 @@
       'lib/internal/main/prof_process.js',
       'lib/internal/main/repl.js',
       'lib/internal/main/run_main_module.js',
-      'lib/internal/main/run_third_party_main.js',
       'lib/internal/main/worker_thread.js',
       'lib/internal/modules/run_main.js',
       'lib/internal/modules/package_json_reader.js',
diff --git a/src/node.cc b/src/node.cc
index b7435d67f839ea..b83e888ab3cb1d 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -461,13 +461,6 @@ MaybeLocal<Value> StartExecution(Environment* env, StartExecutionCallback cb) {
     return scope.EscapeMaybe(cb(info));
   }
 
-  // To allow people to extend Node in different ways, this hook allows
-  // one to drop a file lib/_third_party_main.js into the build
-  // directory which will be executed instead of Node's normal loading.
-  if (NativeModuleEnv::Exists("_third_party_main")) {
-    return StartExecution(env, "internal/main/run_third_party_main");
-  }
-
   if (env->worker_context() != nullptr) {
     return StartExecution(env, "internal/main/worker_thread");
   }