diff --git a/CHANGELOG.md b/CHANGELOG.md
index 136e4ed08..aaedfc010 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,8 @@ release.
 
 - Add `code.stacktrace` attribute
   ([#435](https://github.com/open-telemetry/semantic-conventions/pull/435))
+- Add `http.flavor` and `http.user_agent` to list of deprecated attributes
+  ([#503](https://github.com/open-telemetry/semantic-conventions/pull/503))
 
 ### Fixes
 
diff --git a/docs/attributes-registry/http.md b/docs/attributes-registry/http.md
index ee711c7e4..06c8568be 100644
--- a/docs/attributes-registry/http.md
+++ b/docs/attributes-registry/http.md
@@ -67,6 +67,7 @@ SHOULD include the [application root](/docs/http/http-spans.md#http-server-defin
 <!-- semconv attributes.http.deprecated(omit_requirement_level) -->
 | Attribute  | Type | Description  | Examples  |
 |---|---|---|---|
+| `http.flavor` | string | Deprecated, use `network.procol.name` instead. | `1.0` |
 | `http.method` | string | Deprecated, use `http.request.method` instead. | `GET`; `POST`; `HEAD` |
 | `http.request_content_length` | int | Deprecated, use `http.request.header.content-length` instead. | `3495` |
 | `http.response_content_length` | int | Deprecated, use `http.response.header.content-length` instead. | `3495` |
@@ -74,4 +75,16 @@ SHOULD include the [application root](/docs/http/http-spans.md#http-server-defin
 | `http.status_code` | int | Deprecated, use `http.response.status_code` instead. | `200` |
 | `http.target` | string | Deprecated, use `url.path` and `url.query` instead. | `/search?q=OpenTelemetry#SemConv` |
 | `http.url` | string | Deprecated, use `url.full` instead. | `https://www.foo.bar/search?q=OpenTelemetry#SemConv` |
+| `http.user_agent` | string | Deprecated, use `user_agent.original` instead. | `CERN-LineMode/2.15 libwww/2.17b3`; `Mozilla/5.0 (iPhone; CPU iPhone OS 14_7_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.1.2 Mobile/15E148 Safari/604.1` |
+
+`http.flavor` has the following list of well-known values. If one of them applies, then the respective value MUST be used, otherwise a custom value MAY be used.
+
+| Value  | Description |
+|---|---|
+| `1.0` | HTTP/1.0 |
+| `1.1` | HTTP/1.1 |
+| `2.0` | HTTP/2 |
+| `3.0` | HTTP/3 |
+| `SPDY` | SPDY protocol. |
+| `QUIC` | QUIC protocol. |
 <!-- endsemconv -->
diff --git a/model/registry/deprecated/http.yaml b/model/registry/deprecated/http.yaml
index de45180bb..dcd1b411a 100644
--- a/model/registry/deprecated/http.yaml
+++ b/model/registry/deprecated/http.yaml
@@ -39,3 +39,33 @@ groups:
         brief: 'Deprecated, use `http.response.header.content-length` instead.'
         stability: deprecated
         examples: 3495
+      - id: flavor
+        type:
+          allow_custom_values: true
+          members:
+            - id: http_1_0
+              value: '1.0'
+              brief: 'HTTP/1.0'
+            - id: http_1_1
+              value: '1.1'
+              brief: 'HTTP/1.1'
+            - id: http_2_0
+              value: '2.0'
+              brief: 'HTTP/2'
+            - id: http_3_0
+              value: '3.0'
+              brief: 'HTTP/3'
+            - id: spdy
+              value: 'SPDY'
+              brief: 'SPDY protocol.'
+            - id: quic
+              value: 'QUIC'
+              brief: 'QUIC protocol.'
+        brief: 'Deprecated, use `network.procol.name` instead.'
+        stability: deprecated
+      - id: user_agent
+        type: string
+        brief: 'Deprecated, use `user_agent.original` instead.'
+        examples: ['CERN-LineMode/2.15 libwww/2.17b3',
+                   'Mozilla/5.0 (iPhone; CPU iPhone OS 14_7_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.1.2 Mobile/15E148 Safari/604.1']
+        stability: deprecated