diff --git a/cmake/CompilerFlags.cmake b/cmake/CompilerFlags.cmake
index bf1e7f8eef..798866cbf1 100644
--- a/cmake/CompilerFlags.cmake
+++ b/cmake/CompilerFlags.cmake
@@ -24,9 +24,19 @@ if(CMAKE_SYSTEM_PROCESSOR MATCHES "arm|ARM|arm64|ARM64|aarch64|AARCH64")
   elseif(WIN32)
     # Windows ARM64: use /clang: prefix for clang-cl, skip for MSVC cl.exe subprojects
     # These flags are only understood by clang-cl, not MSVC cl.exe
-    register_compiler_flags(/clang:-march=armv8-a+crc /clang:-mtune=ampere1)
+    if(ENABLE_BASELINE)
+      # Baseline: ARMv8.0-A compatible, use outline atomics for LSE compatibility
+      register_compiler_flags(/clang:-march=armv8-a+crc /clang:-moutline-atomics)
+    else()
+      register_compiler_flags(/clang:-march=armv8-a+crc /clang:-mtune=ampere1)
+    endif()
   else()
-    register_compiler_flags(-march=armv8-a+crc -mtune=ampere1)
+    if(ENABLE_BASELINE)
+      # Baseline: ARMv8.0-A compatible, use outline atomics for LSE compatibility
+      register_compiler_flags(-march=armv8-a+crc -moutline-atomics)
+    else()
+      register_compiler_flags(-march=armv8-a+crc -mtune=ampere1)
+    endif()
   endif()
 elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64|X86_64|x64|X64|amd64|AMD64")
   if(ENABLE_BASELINE)
diff --git a/cmake/Options.cmake b/cmake/Options.cmake
index 47e8e55457..fd143cb23a 100644
--- a/cmake/Options.cmake
+++ b/cmake/Options.cmake
@@ -99,6 +99,8 @@ endif()
 
 if(ARCH STREQUAL "x64")
   optionx(ENABLE_BASELINE BOOL "If baseline features should be used for older CPUs (e.g. disables AVX, AVX2)" DEFAULT OFF)
+elseif(ARCH STREQUAL "aarch64")
+  optionx(ENABLE_BASELINE BOOL "If baseline features should be used for older ARM64 CPUs (e.g. ARMv8.0-A without LSE)" DEFAULT OFF)
 endif()
 
 # Disabling logs by default for tests yields faster builds
diff --git a/cmake/tools/SetupWebKit.cmake b/cmake/tools/SetupWebKit.cmake
index 2275644005..2a45023da3 100644
--- a/cmake/tools/SetupWebKit.cmake
+++ b/cmake/tools/SetupWebKit.cmake
@@ -84,6 +84,10 @@ if(LINUX AND ABI STREQUAL "musl")
   set(WEBKIT_SUFFIX "-musl")
 endif()
 
+if(ENABLE_BASELINE)
+  set(WEBKIT_SUFFIX "${WEBKIT_SUFFIX}-baseline")
+endif()
+
 if(DEBUG)
   set(WEBKIT_SUFFIX "${WEBKIT_SUFFIX}-debug")
 elseif(ENABLE_LTO)