diff --git a/.wolfssl_known_macro_extras b/.wolfssl_known_macro_extras
index 4d5c99f71d..cc6ba25169 100644
--- a/.wolfssl_known_macro_extras
+++ b/.wolfssl_known_macro_extras
@@ -563,6 +563,7 @@ STM32L552xx
 STM32L562xx
 STM32MP135Fxx
 STM32N657xx
+STM32U385xx
 STM32U575xx
 STM32U585xx
 STM32U5A9xx
diff --git a/IDE/STM32Cube/README.md b/IDE/STM32Cube/README.md
index ebce241a08..20ed0b06ea 100644
--- a/IDE/STM32Cube/README.md
+++ b/IDE/STM32Cube/README.md
@@ -97,6 +97,7 @@ The section for "Hardware platform" may need to be adjusted depending on your pr
 * To enable STM32WB support define `WOLFSSL_STM32WB`.
 * To enable STM32WBA support define `WOLFSSL_STM32WBA`.
 * To enable STM32WL support define `WOLFSSL_STM32WL`.
+* To enable STM32U3 support define `WOLFSSL_STM32U3`.
 * To enable STM32U5 support define `WOLFSSL_STM32U5`.
 * To enable STM32H5 support define `WOLFSSL_STM32H5`.
 * To enable STM32MP13 support define `WOLFSSL_STM32MP13`.
diff --git a/IDE/STM32Cube/default_conf.ftl b/IDE/STM32Cube/default_conf.ftl
index 951e319baf..c494cf9f02 100644
--- a/IDE/STM32Cube/default_conf.ftl
+++ b/IDE/STM32Cube/default_conf.ftl
@@ -206,6 +206,14 @@ extern ${variable.value} ${variable.name};
 #elif defined(STM32G491xx)
     #define WOLFSSL_STM32G4
     #define HAL_CONSOLE_UART hlpuart1
+#elif defined(STM32U385xx)
+    #define WOLFSSL_STM32U3
+    #define STM32_HAL_V2
+    #undef  NO_STM32_HASH
+    #undef  NO_STM32_CRYPTO
+    #ifndef HAL_CONSOLE_UART
+    #define HAL_CONSOLE_UART huart1
+    #endif
 #elif defined(STM32U575xx) || defined(STM32U585xx) || defined(STM32U5A9xx)
     #define WOLFSSL_STM32U5
     #define STM32_HAL_V2
@@ -250,8 +258,8 @@ extern ${variable.value} ${variable.name};
     /* You need to define a CPU type, HW crypto and debug UART */
     /* CPU Type: WOLFSSL_STM32F1, WOLFSSL_STM32F2, WOLFSSL_STM32F4,
         WOLFSSL_STM32F7, WOLFSSL_STM32H7, WOLFSSL_STM32L4, WOLFSSL_STM32L5,
-        WOLFSSL_STM32G0, WOLFSSL_STM32G4, WOLFSSL_STM32WB, WOLFSSL_STM32U5 and
-        WOLFSSL_STM32MP13 */
+        WOLFSSL_STM32G0, WOLFSSL_STM32G4, WOLFSSL_STM32WB, WOLFSSL_STM32U3,
+        WOLFSSL_STM32U5 and WOLFSSL_STM32MP13 */
     #define WOLFSSL_STM32F4
 
     /* Debug UART used for printf */
diff --git a/wolfssl/wolfcrypt/port/st/stm32.h b/wolfssl/wolfcrypt/port/st/stm32.h
index e073976619..9aa0d418ae 100644
--- a/wolfssl/wolfcrypt/port/st/stm32.h
+++ b/wolfssl/wolfcrypt/port/st/stm32.h
@@ -166,9 +166,10 @@ int wc_Stm32_Hmac_Final(STM32_HASH_Context* stmCtx, word32 algo,
     #if !defined(STM32_CRYPTO_AES_GCM) && (defined(WOLFSSL_STM32F4) || \
             defined(WOLFSSL_STM32F7) || defined(WOLFSSL_STM32L4) || \
             defined(WOLFSSL_STM32L5) || defined(WOLFSSL_STM32H7) || \
-            defined(WOLFSSL_STM32U5) || defined(WOLFSSL_STM32H5) || \
-            defined(WOLFSSL_STM32MP13) || defined(WOLFSSL_STM32H7S) || \
-            defined(WOLFSSL_STM32N6) || defined(WOLFSSL_STM32G0))
+            defined(WOLFSSL_STM32U5) || defined(WOLFSSL_STM32U3) || \
+            defined(WOLFSSL_STM32H5) || defined(WOLFSSL_STM32MP13) || \
+            defined(WOLFSSL_STM32H7S) || defined(WOLFSSL_STM32N6) || \
+            defined(WOLFSSL_STM32G0))
         /* Hardware supports AES GCM acceleration */
         #define STM32_CRYPTO_AES_GCM
     #endif
@@ -184,10 +185,10 @@ int wc_Stm32_Hmac_Final(STM32_HASH_Context* stmCtx, word32 algo,
         #define STM32_HAL_V2
     #endif
     #if defined(WOLFSSL_STM32L4) || defined(WOLFSSL_STM32L5) || \
-        defined(WOLFSSL_STM32U5) || defined(WOLFSSL_STM32H5) || \
-        defined(WOLFSSL_STM32G0)
+        defined(WOLFSSL_STM32U5) || defined(WOLFSSL_STM32U3) || \
+        defined(WOLFSSL_STM32H5) || defined(WOLFSSL_STM32G0)
         #if defined(WOLFSSL_STM32L4) || defined(WOLFSSL_STM32U5) || \
-            defined(WOLFSSL_STM32G0)
+            defined(WOLFSSL_STM32U3) || defined(WOLFSSL_STM32G0)
             #define STM32_CRYPTO_AES_ONLY /* crypto engine only supports AES */
         #endif
         #if defined(WOLFSSL_STM32H5)
@@ -204,9 +205,9 @@ int wc_Stm32_Hmac_Final(STM32_HASH_Context* stmCtx, word32 algo,
     #if !defined(STM32_HAL_V2) && defined(CRYP_AES_GCM) && \
         (defined(WOLFSSL_STM32F7) || defined(WOLFSSL_STM32L5) || \
          defined(WOLFSSL_STM32H7) || defined(WOLFSSL_STM32U5) || \
-         defined(WOLFSSL_STM32H5) || defined(WOLFSSL_STM32MP13) || \
-         defined(WOLFSSL_STM32H7S) || defined(WOLFSSL_STM32N6) || \
-         defined(WOLFSSL_STM32G0))
+         defined(WOLFSSL_STM32U3) || defined(WOLFSSL_STM32H5) || \
+         defined(WOLFSSL_STM32MP13) || defined(WOLFSSL_STM32H7S) || \
+         defined(WOLFSSL_STM32N6) || defined(WOLFSSL_STM32G0))
         #define STM32_HAL_V2
     #endif
 
diff --git a/wolfssl/wolfcrypt/settings.h b/wolfssl/wolfcrypt/settings.h
index 32fa66fb62..201982f0db 100644
--- a/wolfssl/wolfcrypt/settings.h
+++ b/wolfssl/wolfcrypt/settings.h
@@ -2198,10 +2198,10 @@ extern void uITRON4_free(void *p) ;
     defined(WOLFSSL_STM32L4)  || defined(WOLFSSL_STM32L5)   || \
     defined(WOLFSSL_STM32WB)  || defined(WOLFSSL_STM32H7)   || \
     defined(WOLFSSL_STM32G0)  || defined(WOLFSSL_STM32U5)   || \
-    defined(WOLFSSL_STM32H5)  || defined(WOLFSSL_STM32WL)   || \
-    defined(WOLFSSL_STM32G4)  || defined(WOLFSSL_STM32MP13) || \
-    defined(WOLFSSL_STM32H7S) || defined(WOLFSSL_STM32WBA)  || \
-    defined(WOLFSSL_STM32N6)
+    defined(WOLFSSL_STM32U3)  || defined(WOLFSSL_STM32H5)   || \
+    defined(WOLFSSL_STM32WL)  || defined(WOLFSSL_STM32G4)   || \
+    defined(WOLFSSL_STM32MP13) || defined(WOLFSSL_STM32H7S) || \
+    defined(WOLFSSL_STM32WBA) || defined(WOLFSSL_STM32N6)
 
     #define SIZEOF_LONG_LONG 8
     #ifndef CHAR_BIT
@@ -2222,7 +2222,8 @@ extern void uITRON4_free(void *p) ;
 
         #if defined(WOLFSSL_STM32L4) || defined(WOLFSSL_STM32L5) || \
             defined(WOLFSSL_STM32WB) || defined(WOLFSSL_STM32U5) || \
-            defined(WOLFSSL_STM32WL) || defined(WOLFSSL_STM32WBA)
+            defined(WOLFSSL_STM32U3) || defined(WOLFSSL_STM32WL) || \
+            defined(WOLFSSL_STM32WBA)
             #define NO_AES_192 /* hardware does not support 192-bit */
         #endif
     #endif
@@ -2267,6 +2268,8 @@ extern void uITRON4_free(void *p) ;
             #include "stm32g4xx_hal.h"
         #elif defined(WOLFSSL_STM32U5)
             #include "stm32u5xx_hal.h"
+        #elif defined(WOLFSSL_STM32U3)
+            #include "stm32u3xx_hal.h"
         #elif defined(WOLFSSL_STM32H5)
             #include "stm32h5xx_hal.h"
         #elif defined(WOLFSSL_STM32N6)