diff --git a/flang/CMakeLists.txt b/flang/CMakeLists.txt
index 0f98d12343c43..2940febb40df5 100644
--- a/flang/CMakeLists.txt
+++ b/flang/CMakeLists.txt
@@ -473,6 +473,17 @@ if (APPLE)
   endif()
 endif()
 
+# Set up job pools for flang.  Some of the flang sources take a lot of memory to
+# compile, so allow users to limit the number of parallel flang jobs.  This is
+# useful for building flang alongside several other projects since you can use
+# the maximum number of build jobs for the other projects while limiting the
+# number of flang compile jobs.
+set(FLANG_PARALLEL_COMPILE_JOBS CACHE STRING
+  "The maximum number of concurrent compilation jobs for Flang (Ninja only)")
+if (FLANG_PARALLEL_COMPILE_JOBS)
+  set_property(GLOBAL APPEND PROPERTY JOB_POOLS flang_compile_job_pool=${FLANG_PARALLEL_COMPILE_JOBS})
+endif()
+
 include(AddFlang)
 
 if (FLANG_INCLUDE_TESTS)
diff --git a/flang/cmake/modules/AddFlang.cmake b/flang/cmake/modules/AddFlang.cmake
index badbd4e7b964b..ca233103ccdbe 100644
--- a/flang/cmake/modules/AddFlang.cmake
+++ b/flang/cmake/modules/AddFlang.cmake
@@ -94,6 +94,9 @@ function(add_flang_library name)
       set_property(GLOBAL APPEND PROPERTY FLANG_LIBS ${name})
     endif()
     set_property(GLOBAL APPEND PROPERTY FLANG_EXPORTS ${name})
+    if (FLANG_PARALLEL_COMPILE_JOBS)
+      set_property(TARGET ${name} PROPERTY JOB_POOL_COMPILE flang_compile_job_pool)
+    endif()
   else()
     # Add empty "phony" target
     add_custom_target(${name})