diff --git a/javascript/sentry-conventions/src/attributes.ts b/javascript/sentry-conventions/src/attributes.ts
index 041ac192..4492d801 100644
--- a/javascript/sentry-conventions/src/attributes.ts
+++ b/javascript/sentry-conventions/src/attributes.ts
@@ -10854,6 +10854,8 @@ export type PROCESS_EXECUTABLE_NAME_TYPE = string;
  * Attribute defined in OTEL: Yes
  * Visibility: public
  *
+ * Aliases: {@link SUBPROCESS_PID} `subprocess.pid`
+ *
  * @example 12345
  */
 export const PROCESS_PID = 'process.pid';
@@ -13169,6 +13171,30 @@ export const STATE_TYPE = 'state.type';
  */
 export type STATE_TYPE_TYPE = string;
 
+// Path: model/attributes/subprocess/subprocess__pid.json
+
+/**
+ * The process ID of a subprocess. `subprocess.pid`
+ *
+ * Attribute Value Type: `number` {@link SUBPROCESS_PID_TYPE}
+ *
+ * Apply Scrubbing: manual
+ *
+ * Attribute defined in OTEL: No
+ * Visibility: public
+ *
+ * Aliases: {@link PROCESS_PID} `process.pid`
+ *
+ * @deprecated Use {@link PROCESS_PID} (process.pid) instead - This attribute is being deprecated in favor of process.pid, which is the OTel-aligned replacement.
+ * @example 12345
+ */
+export const SUBPROCESS_PID = 'subprocess.pid';
+
+/**
+ * Type for {@link SUBPROCESS_PID} subprocess.pid
+ */
+export type SUBPROCESS_PID_TYPE = number;
+
 // Path: model/attributes/thread/thread__id.json
 
 /**
@@ -15601,6 +15627,7 @@ export const ATTRIBUTE_TYPE: Record<string, AttributeType> = {
   stall_percentage: 'double',
   stall_total_time: 'double',
   'state.type': 'string',
+  'subprocess.pid': 'integer',
   'thread.id': 'integer',
   'thread.name': 'string',
   'timber.tag': 'string',
@@ -16283,6 +16310,7 @@ export type AttributeName =
   | typeof STALL_PERCENTAGE
   | typeof STALL_TOTAL_TIME
   | typeof STATE_TYPE
+  | typeof SUBPROCESS_PID
   | typeof THREAD_ID
   | typeof THREAD_NAME
   | typeof TIMBER_TAG
@@ -23067,7 +23095,12 @@ export const ATTRIBUTE_METADATA: Record<AttributeName, AttributeMetadata> = {
     isInOtel: true,
     visibility: 'public',
     example: 12345,
-    changelog: [{ version: '0.4.0', prs: [228] }, { version: '0.0.0' }],
+    aliases: ['subprocess.pid'],
+    changelog: [
+      { version: 'next', description: 'Added subprocess.pid as an alias' },
+      { version: '0.4.0', prs: [228] },
+      { version: '0.0.0' },
+    ],
   },
   'process.runtime.description': {
     brief:
@@ -24402,6 +24435,22 @@ export const ATTRIBUTE_METADATA: Record<AttributeName, AttributeMetadata> = {
     example: 'redux',
     changelog: [{ version: '0.7.0', prs: [365], description: 'Added state.type attribute' }],
   },
+  'subprocess.pid': {
+    brief: 'The process ID of a subprocess.',
+    type: 'integer',
+    applyScrubbing: {
+      key: 'manual',
+    },
+    isInOtel: false,
+    visibility: 'public',
+    example: 12345,
+    deprecation: {
+      replacement: 'process.pid',
+      reason: 'This attribute is being deprecated in favor of process.pid, which is the OTel-aligned replacement.',
+    },
+    aliases: ['process.pid'],
+    changelog: [{ version: 'next', description: 'Added subprocess.pid attribute, deprecated in favor of process.pid' }],
+  },
   'thread.id': {
     brief: 'Current “managed” thread ID.',
     type: 'integer',
@@ -25993,6 +26042,7 @@ export type Attributes = {
   [STALL_PERCENTAGE]?: STALL_PERCENTAGE_TYPE;
   [STALL_TOTAL_TIME]?: STALL_TOTAL_TIME_TYPE;
   [STATE_TYPE]?: STATE_TYPE_TYPE;
+  [SUBPROCESS_PID]?: SUBPROCESS_PID_TYPE;
   [THREAD_ID]?: THREAD_ID_TYPE;
   [THREAD_NAME]?: THREAD_NAME_TYPE;
   [TIMBER_TAG]?: TIMBER_TAG_TYPE;
diff --git a/model/attributes/process/process__pid.json b/model/attributes/process/process__pid.json
index 93ceba5f..48908284 100644
--- a/model/attributes/process/process__pid.json
+++ b/model/attributes/process/process__pid.json
@@ -7,8 +7,13 @@
   },
   "is_in_otel": true,
   "example": 12345,
+  "alias": ["subprocess.pid"],
   "visibility": "public",
   "changelog": [
+    {
+      "version": "next",
+      "description": "Added subprocess.pid as an alias"
+    },
     {
       "version": "0.4.0",
       "prs": [228]
diff --git a/model/attributes/subprocess/subprocess__pid.json b/model/attributes/subprocess/subprocess__pid.json
new file mode 100644
index 00000000..15182b71
--- /dev/null
+++ b/model/attributes/subprocess/subprocess__pid.json
@@ -0,0 +1,23 @@
+{
+  "key": "subprocess.pid",
+  "brief": "The process ID of a subprocess.",
+  "type": "integer",
+  "apply_scrubbing": {
+    "key": "manual"
+  },
+  "is_in_otel": false,
+  "example": 12345,
+  "alias": ["process.pid"],
+  "deprecation": {
+    "_status": "backfill",
+    "replacement": "process.pid",
+    "reason": "This attribute is being deprecated in favor of process.pid, which is the OTel-aligned replacement."
+  },
+  "visibility": "public",
+  "changelog": [
+    {
+      "version": "next",
+      "description": "Added subprocess.pid attribute, deprecated in favor of process.pid"
+    }
+  ]
+}
diff --git a/python/src/sentry_conventions/attributes.py b/python/src/sentry_conventions/attributes.py
index 90122d51..180d8a76 100644
--- a/python/src/sentry_conventions/attributes.py
+++ b/python/src/sentry_conventions/attributes.py
@@ -273,6 +273,7 @@ class _AttributeNamesMeta(type):
         "SENTRY_USER_ID",
         "SENTRY_USER_IP",
         "SENTRY_USER_USERNAME",
+        "SUBPROCESS_PID",
         "TIME_TO_FULL_DISPLAY",
         "TIME_TO_INITIAL_DISPLAY",
         "TRANSACTION",
@@ -6383,6 +6384,7 @@ class ATTRIBUTE_NAMES(metaclass=_AttributeNamesMeta):
     Apply Scrubbing: manual
     Defined in OTEL: Yes
     Visibility: public
+    Aliases: subprocess.pid
     Example: 12345
     """
 
@@ -7659,6 +7661,19 @@ class ATTRIBUTE_NAMES(metaclass=_AttributeNamesMeta):
     Example: "redux"
     """
 
+    # Path: model/attributes/subprocess/subprocess__pid.json
+    SUBPROCESS_PID: Literal["subprocess.pid"] = "subprocess.pid"
+    """The process ID of a subprocess.
+
+    Type: int
+    Apply Scrubbing: manual
+    Defined in OTEL: No
+    Visibility: public
+    Aliases: process.pid
+    DEPRECATED: Use process.pid instead - This attribute is being deprecated in favor of process.pid, which is the OTel-aligned replacement.
+    Example: 12345
+    """
+
     # Path: model/attributes/thread/thread__id.json
     THREAD_ID: Literal["thread.id"] = "thread.id"
     """Current “managed” thread ID.
@@ -15848,7 +15863,11 @@ class ATTRIBUTE_NAMES(metaclass=_AttributeNamesMeta):
         is_in_otel=True,
         visibility=Visibility.PUBLIC,
         example=12345,
+        aliases=["subprocess.pid"],
         changelog=[
+            ChangelogEntry(
+                version="next", description="Added subprocess.pid as an alias"
+            ),
             ChangelogEntry(version="0.4.0", prs=[228]),
             ChangelogEntry(version="0.0.0"),
         ],
@@ -17206,6 +17225,26 @@ class ATTRIBUTE_NAMES(metaclass=_AttributeNamesMeta):
             ),
         ],
     ),
+    "subprocess.pid": AttributeMetadata(
+        brief="The process ID of a subprocess.",
+        type=AttributeType.INTEGER,
+        apply_scrubbing=ApplyScrubbingInfo(key=ApplyScrubbing.MANUAL),
+        is_in_otel=False,
+        visibility=Visibility.PUBLIC,
+        example=12345,
+        deprecation=DeprecationInfo(
+            replacement="process.pid",
+            reason="This attribute is being deprecated in favor of process.pid, which is the OTel-aligned replacement.",
+            status=DeprecationStatus.BACKFILL,
+        ),
+        aliases=["process.pid"],
+        changelog=[
+            ChangelogEntry(
+                version="next",
+                description="Added subprocess.pid attribute, deprecated in favor of process.pid",
+            ),
+        ],
+    ),
     "thread.id": AttributeMetadata(
         brief="Current “managed” thread ID.",
         type=AttributeType.INTEGER,
@@ -18841,6 +18880,7 @@ class ATTRIBUTE_NAMES(metaclass=_AttributeNamesMeta):
         "stall_percentage": float,
         "stall_total_time": float,
         "state.type": str,
+        "subprocess.pid": int,
         "thread.id": int,
         "thread.name": str,
         "timber.tag": str,