diff --git a/include/coap3/coap_session.h b/include/coap3/coap_session.h
index 19d300fa..a4cc3d84 100644
--- a/include/coap3/coap_session.h
+++ b/include/coap3/coap_session.h
@@ -198,6 +198,15 @@ coap_proto_t coap_session_get_proto(const coap_session_t *session);
  */
 coap_session_type_t coap_session_get_type(const coap_session_t *session);
 
+/**
+ * Check if the session is using OSCORE.
+ *
+ * @param session The CoAP session.
+ *
+ * @return @c 1 if the session is using OSCORE, @c 0 otherwise.
+ */
+int coap_session_is_oscore(const coap_session_t *session);
+
 /**
  * Get the session state
  *
diff --git a/libcoap-3.map b/libcoap-3.map
index fc08738b..d6792008 100644
--- a/libcoap-3.map
+++ b/libcoap-3.map
@@ -299,6 +299,7 @@ global:
   coap_session_get_tls;
   coap_session_get_type;
   coap_session_init_token;
+  coap_session_is_oscore;
   coap_session_max_pdu_size;
   coap_session_new_token;
   coap_session_reference;
diff --git a/libcoap-3.sym b/libcoap-3.sym
index a33eab23..941ba0b3 100644
--- a/libcoap-3.sym
+++ b/libcoap-3.sym
@@ -297,6 +297,7 @@ coap_session_get_state
 coap_session_get_tls
 coap_session_get_type
 coap_session_init_token
+coap_session_is_oscore
 coap_session_max_pdu_size
 coap_session_new_token
 coap_session_reference
diff --git a/man/Makefile.am b/man/Makefile.am
index 6571f17a..a47ea940 100644
--- a/man/Makefile.am
+++ b/man/Makefile.am
@@ -232,6 +232,7 @@ install-man: install-man3 install-man5 install-man7
 	@echo ".so man3/coap_session.3" > coap_session_get_state.3
 	@echo ".so man3/coap_session.3" > coap_session_get_tls.3
 	@echo ".so man3/coap_session.3" > coap_session_get_type.3
+	@echo ".so man3/coap_session.3" > coap_session_is_oscore.3
 	@echo ".so man3/coap_string.3" > coap_delete_bin_const.3
 	@echo ".so man3/coap_string.3" > coap_make_str_const.3
 	@echo ".so man3/coap_string.3" > coap_string_equal.3
diff --git a/man/coap_session.txt.in b/man/coap_session.txt.in
index 9d940a7f..6de38165 100644
--- a/man/coap_session.txt.in
+++ b/man/coap_session.txt.in
@@ -26,6 +26,7 @@ coap_session_get_proto,
 coap_session_get_state,
 coap_session_get_tls,
 coap_session_get_type,
+coap_session_is_oscore,
 coap_session_get_psk_hint,
 coap_session_get_psk_key,
 coap_endpoint_set_app_data,
@@ -71,6 +72,8 @@ coap_tls_library_t *tls_lib);*
 
 *coap_session_type_t coap_session_get_type(const coap_session_t *_session_);*
 
+*int coap_session_is_oscore(const coap_session_t *_session_);*
+
 *const coap_bin_const_t *coap_session_get_psk_hint(
 const coap_session_t *_session_);*
 
@@ -249,6 +252,9 @@ COAP_SESSION_TYPE_HELLO  /* Negotiating a (D)TLS session */
 The *coap_session_get_type*() function is used to get the session type from the
 _session_.
 
+The *coap_session_is_oscore*() function returns whether the _session_ is
+using OSCORE.  Returns 1 if the session is using OSCORE, 0 otherwise.
+
 The *coap_session_get_psk_hint*() function is used to get the current server
 _session_'s pre-shared-key identity hint.
 
@@ -289,6 +295,8 @@ error.
 
 *coap_session_get_type*() returns the current session's type or 0 on error.
 
+*coap_session_is_oscore*() returns 1 if the session is using OSCORE, 0 otherwise.
+
 *coap_session_get_psk_hint*() returns the current server session's
 pre-shared-key identity hint, or NULL if not defined.
 
diff --git a/src/coap_session.c b/src/coap_session.c
index 34b9a1e5..56283e89 100644
--- a/src/coap_session.c
+++ b/src/coap_session.c
@@ -2338,6 +2338,16 @@ coap_session_get_type(const coap_session_t *session) {
   return 0;
 }
 
+int
+coap_session_is_oscore(const coap_session_t *session) {
+#if COAP_OSCORE_SUPPORT
+  return (session && session->oscore_encryption != 0) ? 1 : 0;
+#else
+  (void)session;
+  return 0;
+#endif
+}
+
 COAP_API int
 coap_session_set_type_client(coap_session_t *session) {
   int ret;