diff --git a/docs/api/process.md b/docs/api/process.md
index ec77bda8b8..ee00672129 100644
--- a/docs/api/process.md
+++ b/docs/api/process.md
@@ -22,6 +22,7 @@ In sandboxed renderers the `process` object contains only a subset of the APIs:
 * `getSystemVersion()`
 * `getCPUUsage()`
 * `getIOCounters()`
+* `uptime()`
 * `argv`
 * `execPath`
 * `env`
diff --git a/shell/renderer/electron_sandboxed_renderer_client.cc b/shell/renderer/electron_sandboxed_renderer_client.cc
index bba81eb28f..dca4cb6861 100644
--- a/shell/renderer/electron_sandboxed_renderer_client.cc
+++ b/shell/renderer/electron_sandboxed_renderer_client.cc
@@ -90,6 +90,11 @@ v8::Local<v8::Value> CreatePreloadScript(v8::Isolate* isolate,
                                        preloadSrc);
 }
 
+double Uptime() {
+  return (base::Time::Now() - base::Process::Current().CreationTime())
+      .InSecondsF();
+}
+
 void InvokeHiddenCallback(v8::Handle<v8::Context> context,
                           const std::string& hidden_key,
                           const std::string& callback_name) {
@@ -137,6 +142,7 @@ void ElectronSandboxedRendererClient::InitializeBindings(
 
   ElectronBindings::BindProcess(isolate, &process, metrics_.get());
 
+  process.SetMethod("uptime", Uptime);
   process.Set("argv", base::CommandLine::ForCurrentProcess()->argv());
   process.SetReadOnly("pid", base::GetCurrentProcId());
   process.SetReadOnly("sandboxed", true);
diff --git a/spec-main/api-browser-window-spec.ts b/spec-main/api-browser-window-spec.ts
index 587457c028..d72b8daad0 100644
--- a/spec-main/api-browser-window-spec.ts
+++ b/spec-main/api-browser-window-spec.ts
@@ -2533,6 +2533,7 @@ describe('BrowserWindow module', () => {
         expect(test.systemVersion).to.be.a('string');
         expect(test.cpuUsage).to.be.an('object');
         expect(test.ioCounters).to.be.an('object');
+        expect(test.uptime).to.be.a('number');
         expect(test.arch).to.equal(process.arch);
         expect(test.platform).to.equal(process.platform);
         expect(test.env).to.deep.equal(process.env);
diff --git a/spec-main/fixtures/module/preload-sandbox.js b/spec-main/fixtures/module/preload-sandbox.js
index 524771046a..3f216a3e03 100644
--- a/spec-main/fixtures/module/preload-sandbox.js
+++ b/spec-main/fixtures/module/preload-sandbox.js
@@ -33,6 +33,7 @@
         systemVersion: invoke(() => process.getSystemVersion()),
         cpuUsage: invoke(() => process.getCPUUsage()),
         ioCounters: invoke(() => process.getIOCounters()),
+        uptime: invoke(() => process.uptime()),
         env: process.env,
         execPath: process.execPath,
         pid: process.pid,