diff --git a/arch/risc-v/Kconfig b/arch/risc-v/Kconfig
index cf97f0c306..7f6f0c3954 100644
--- a/arch/risc-v/Kconfig
+++ b/arch/risc-v/Kconfig
@@ -371,6 +371,18 @@ config ARCH_RV_ISA_ZICSR_ZIFENCEI
 		clang < 17 or GCC < 11.3.0, for which this is not possible or need
 		special treatment.
 
+config ARCH_RV_EXPERIMENTAL_EXTENSIONS
+	string "LLVM RISC-V Experimental Extensions"
+	default ""
+	depends on RISCV_TOOLCHAIN_CLANG
+	---help---
+		This option allows the platform to enable experimental extensions,
+		LLVM supports (to various degrees) a number of experimental extensions.
+		All experimental extensions have experimental- as a prefix. There is
+		explicitly no compatibility promised between versions of the toolchain,
+		and regular users are strongly advised not to make use of experimental
+		extensions before they reach ratification.
+
 config ARCH_RV_ISA_VENDOR_EXTENSIONS
 	string "Vendor Custom RISC-V Instruction Set Architecture Extensions"
 	default ""
diff --git a/arch/risc-v/src/cmake/Toolchain.cmake b/arch/risc-v/src/cmake/Toolchain.cmake
index e475238d53..7beca6b3a4 100644
--- a/arch/risc-v/src/cmake/Toolchain.cmake
+++ b/arch/risc-v/src/cmake/Toolchain.cmake
@@ -264,6 +264,12 @@ if(${CONFIG_RISCV_TOOLCHAIN} STREQUAL GNU_RVG)
     endif()
   endif()
 
+  if(CONFIG_ARCH_RV_EXPERIMENTAL_EXTENSIONS)
+    set(ARCHCPUEXTFLAGS
+        ${ARCHCPUEXTFLAGS}_${CONFIG_ARCH_RV_EXPERIMENTAL_EXTENSIONS})
+    add_compile_options(-menable-experimental-extensions)
+  endif()
+
   if(CONFIG_ARCH_RV_ISA_VENDOR_EXTENSIONS)
     set(ARCHCPUEXTFLAGS
         ${ARCHCPUEXTFLAGS}_${CONFIG_ARCH_RV_ISA_VENDOR_EXTENSIONS})
diff --git a/arch/risc-v/src/common/Toolchain.defs b/arch/risc-v/src/common/Toolchain.defs
index 27d3c0c678..a8fb39e163 100644
--- a/arch/risc-v/src/common/Toolchain.defs
+++ b/arch/risc-v/src/common/Toolchain.defs
@@ -211,6 +211,12 @@ ifeq ($(CONFIG_RISCV_TOOLCHAIN),GNU_RVG)
     endif
   endif
 
+  ARCH_RV_EXPERIMENTAL_EXTENSIONS = $(strip $(subst ",,$(CONFIG_ARCH_RV_EXPERIMENTAL_EXTENSIONS)))
+  ifneq ($(ARCH_RV_EXPERIMENTAL_EXTENSIONS),)
+      ARCHCPUEXTFLAGS := $(ARCHCPUEXTFLAGS)_$(ARCH_RV_EXPERIMENTAL_EXTENSIONS)
+      ARCHOPTIMIZATION += -menable-experimental-extensions
+  endif
+
   ARCH_RV_ISA_VENDOR_EXTENSIONS = $(strip $(subst ",,$(CONFIG_ARCH_RV_ISA_VENDOR_EXTENSIONS)))
   ifneq ($(ARCH_RV_ISA_VENDOR_EXTENSIONS),)
       ARCHCPUEXTFLAGS := $(ARCHCPUEXTFLAGS)_$(ARCH_RV_ISA_VENDOR_EXTENSIONS)