diff --git a/bson/binary.py b/bson/binary.py
index 9a0c061382..0727bd17c0 100644
--- a/bson/binary.py
+++ b/bson/binary.py
@@ -183,6 +183,13 @@ class UuidRepresentation:
 .. versionadded:: 4.0
 """
 
+SENSITIVE_SUBTYPE = 8
+"""BSON binary subtype for sensitive data.
+
+.. versionadded:: 4.5
+"""
+
+
 USER_DEFINED_SUBTYPE = 128
 """BSON binary subtype for any user defined structure.
 """
diff --git a/doc/api/bson/binary.rst b/doc/api/bson/binary.rst
index b9673d70d9..c933a687b9 100644
--- a/doc/api/bson/binary.rst
+++ b/doc/api/bson/binary.rst
@@ -15,6 +15,7 @@
    .. autodata:: CSHARP_LEGACY
    .. autodata:: MD5_SUBTYPE
    .. autodata:: COLUMN_SUBTYPE
+   .. autodata:: SENSITIVE_SUBTYPE
    .. autodata:: USER_DEFINED_SUBTYPE
 
    .. autoclass:: UuidRepresentation
diff --git a/test/bson_corpus/binary.json b/test/bson_corpus/binary.json
index beb2e07a70..20aaef743b 100644
--- a/test/bson_corpus/binary.json
+++ b/test/bson_corpus/binary.json
@@ -55,6 +55,11 @@
             "canonical_bson": "1D000000057800100000000773FFD26444B34C6990E8E7D1DFC035D400",
             "canonical_extjson": "{\"x\" : { \"$binary\" : {\"base64\" : \"c//SZESzTGmQ6OfR38A11A==\", \"subType\" : \"07\"}}}"
         },
+        {
+            "description": "subtype 0x08",
+            "canonical_bson": "1D000000057800100000000873FFD26444B34C6990E8E7D1DFC035D400",
+            "canonical_extjson": "{\"x\" : { \"$binary\" : {\"base64\" : \"c//SZESzTGmQ6OfR38A11A==\", \"subType\" : \"08\"}}}"
+        },
         {
             "description": "subtype 0x80",
             "canonical_bson": "0F0000000578000200000080FFFF00",