--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -206,7 +206,7 @@
   # Set to true to use icf, Identical Code Folding.
   use_icf = (is_posix || is_fuchsia) && !is_debug && !using_sanitizer &&
             !use_clang_coverage && current_os != "zos" &&
-            !(is_android && use_order_profiling) && use_lld
+            !(is_android && use_order_profiling) && (use_lld || use_mold)
 }
 
 if (is_android) {
@@ -377,7 +377,9 @@
       }
     }
 
-    if (use_lld) {
+    if (use_mold) {
+      ldflags += [ "-fuse-ld=mold" ]
+    } else if (use_lld) {
       ldflags += [ "-fuse-ld=lld" ]
       if (lld_path != "") {
         ldflags += [ "-B$lld_path" ]
@@ -430,7 +432,7 @@
       # links.
       ldflags += [ "-Wl,--build-id=sha1" ]
     } else if (current_os != "aix" && current_os != "zos") {
-      if (use_lld && !is_nacl) {
+      if ((use_lld || use_mold) && !is_nacl) {
         ldflags += [ "-Wl,--build-id=fast" ]
       } else {
         ldflags += [ "-Wl,--build-id" ]
@@ -511,7 +513,7 @@
 
   # Linux-specific compiler flags setup.
   # ------------------------------------
-  if (use_icf && (!is_apple || use_lld)) {
+  if (use_icf && (!is_apple || use_lld || use_mold)) {
     ldflags += [ "-Wl,--icf=all" ]
   }
 
@@ -549,7 +551,7 @@
     }
   }
 
-  if (use_lld) {
+  if (use_lld || use_mold) {
     # TODO(thakis): Make the driver pass --color-diagnostics to the linker
     # if -fcolor-diagnostics is passed to it, and pass -fcolor-diagnostics
     # in ldflags instead.
@@ -564,7 +566,7 @@
 
   # Enable text section splitting only on linux when using lld for now. Other
   # platforms can be added later if needed.
-  if ((is_linux || is_chromeos) && use_lld && use_text_section_splitting) {
+  if ((is_linux || is_chromeos) && (use_lld || use_mold) && use_text_section_splitting) {
     ldflags += [ "-Wl,-z,keep-text-section-prefix" ]
   }
 
@@ -732,7 +734,7 @@
   # [0]: https://pinpoint-dot-chromeperf.appspot.com/job/15efb0313e0000
   # [1]: https://pinpoint-dot-chromeperf.appspot.com/job/157f0b42be0000
   if (!is_debug && use_thin_lto && is_a_target_toolchain) {
-    assert(use_lld, "LTO is only supported with lld")
+    assert(use_lld || use_mold, "LTO is only supported with lld or mold")
 
     cflags += [
       "-flto=thin",
@@ -774,7 +776,9 @@
     # [0]: https://pinpoint-dot-chromeperf.appspot.com/job/16984a18be0000
     # [1]: https://pinpoint-dot-chromeperf.appspot.com/job/11984a18be0000
     # [2]: https://ci.chromium.org/ui/p/chromium/builders/try/android-binary-size/1848442
+    if (!use_mold) {
     import_instr_limit = 100
+    }
 
     if (is_win) {
       ldflags += [
@@ -807,7 +811,9 @@
         import_instr_limit = 5
       }
 
+      if (!use_mold) {
       ldflags += [ "-Wl,-mllvm,-import-instr-limit=$import_instr_limit" ]
+      }
 
       if (is_apple) {
         ldflags += [ "-Wcrl,object_path_lto" ]
@@ -815,7 +821,9 @@
 
       # We only use one version of LLVM within a build so there's no need to
       # upgrade debug info, which can be expensive since it runs the verifier.
+      if (!use_mold) {
       ldflags += [ "-Wl,-mllvm,-disable-auto-upgrade-debug-info" ]
+      }
     }
 
     if (!optimize_for_size) {
@@ -827,7 +835,7 @@
       ]
       if (is_win) {
         ldflags += [ "-mllvm:-inlinehint-threshold=360" ]
-      } else {
+      } else if (!use_mold) {
         ldflags += [ "-Wl,-mllvm,-inlinehint-threshold=360" ]
       }
     }
@@ -888,7 +896,7 @@
 
   # TODO(crbug.com/40242425): Cleanup undefined symbol errors caught by
   # --no-undefined-version.
-  if (use_lld && !is_win && !is_mac && !is_ios) {
+  if ((use_lld || use_mold) && !is_win && !is_mac && !is_ios) {
     ldflags += [ "-Wl,--undefined-version" ]
   }
 
@@ -948,7 +956,7 @@
     assert(
         is_android && host_os == "linux",
         "MLGO is currently only supported for targeting Android on a linux host")
-    if (use_thin_lto) {
+    if (use_thin_lto && !use_mold ) {
       ldflags += [ "-Wl,-mllvm,-enable-ml-inliner=release" ]
       if (is_high_end_android) {
         # Besides using the arm64 - trained model, instruct the inline advisor
@@ -1545,7 +1553,9 @@
     # This can be removed once https://bugs.llvm.org/show_bug.cgi?id=40348
     # has been resolved, and -mno-outline is obeyed by the linker during
     # ThinLTO.
+    if (!use_mold) {
     ldflags += [ "-Wl,-mllvm,-enable-machine-outliner=never" ]
+    }
   }
 
   asmflags = cflags
@@ -2928,7 +2938,7 @@
     # sections" there.  Maybe just a bug in nacl_switch_32.S.
     _enable_gdb_index =
         symbol_level == 2 && !is_apple && !is_nacl && current_cpu != "x86" &&
-        current_os != "zos" && use_lld &&
+        current_os != "zos" && (use_lld || use_mold) &&
         # Disable on non-fission 32-bit Android because it pushes
         # libcomponents_unittests over the 4gb size limit.
         !(is_android && !use_debug_fission && current_cpu != "x64" &&
--- a/build/config/compiler/pgo/BUILD.gn
+++ b/build/config/compiler/pgo/BUILD.gn
@@ -150,7 +150,7 @@
     if (use_thin_lto) {
       if (is_win) {
         ldflags = [ "-mllvm:-enable-ext-tsp-block-placement=1" ]
-      } else {
+      } else if (!use_mold) {
         ldflags = [ "-Wl,-mllvm,-enable-ext-tsp-block-placement=1" ]
       }
     } else {
--- a/build/config/compiler/compiler.gni.orig
+++ b/build/config/compiler/compiler.gni
@@ -36,6 +36,9 @@
   # The default linker everywhere else.
   use_lld = is_clang && current_os != "zos"
 
+  # Set to true to use mold, the modern linker.
+  use_mold = false
+
   # If true, optimize for size.
   # Default to favoring speed over size for platforms not listed below.
   optimize_for_size =
@@ -74,7 +77,7 @@
   # gcc >= 4.8 or clang.
   # http://gcc.gnu.org/wiki/DebugFission
   use_debug_fission = !is_android && !is_fuchsia && !is_apple && !is_win &&
-                      use_lld && cc_wrapper == ""
+                      (use_lld || use_mold) && cc_wrapper == ""
 
   # Enables support for ThinLTO, which links 3x-10x faster than full LTO. See
   # also http://blog.llvm.org/2016/06/thinlto-scalable-and-incremental-lto.html