diff --git a/experimental/CHANGELOG.md b/experimental/CHANGELOG.md
index 95d3407dd5..d25839061b 100644
--- a/experimental/CHANGELOG.md
+++ b/experimental/CHANGELOG.md
@@ -11,6 +11,7 @@ All notable changes to experimental packages in this project will be documented
 * feat(instrumentation-http): monitor error events with events.errorMonitor [#3402](https://github.com/open-telemetry/opentelemetry-js/pull/3402) @legendecas
 * feat(instrumentation-grpc): added grpc metadata client side attributes in instrumentation [#3386](https://github.com/open-telemetry/opentelemetry-js/pull/3386)
 * feat(instrumentation): add new `_setMeterInstruments` protected method that update the meter instruments every meter provider update.
+* feat(api-logs): add the `SeverityNumber` enumeration. [#3443](https://github.com/open-telemetry/opentelemetry-js/pull/3443/) @fuaiyi
 
 ### :bug: (Bug Fix)
 
diff --git a/experimental/packages/api-logs/README.md b/experimental/packages/api-logs/README.md
index 57d40a3211..1d5a17fa76 100644
--- a/experimental/packages/api-logs/README.md
+++ b/experimental/packages/api-logs/README.md
@@ -42,7 +42,7 @@ const logger = api.logs.getLogger(name, version);
 logger.emitEvent({ name: 'event-name', domain: 'event-domain' });
 
 // logging an event in a log appender
-logger.emitLogRecord({ severityNumber: 1, body: 'log data' });
+logger.emitLogRecord({ severityNumber: SeverityNumber.TRACE, body: 'log data' });
 ```
 
 ## Useful links
diff --git a/experimental/packages/api-logs/src/types/LogRecord.ts b/experimental/packages/api-logs/src/types/LogRecord.ts
index dab3302911..d64d404752 100644
--- a/experimental/packages/api-logs/src/types/LogRecord.ts
+++ b/experimental/packages/api-logs/src/types/LogRecord.ts
@@ -16,6 +16,34 @@
 
 import { Attributes } from '@opentelemetry/api';
 
+export enum SeverityNumber {
+  UNSPECIFIED = 0,
+  TRACE = 1,
+  TRACE2 = 2,
+  TRACE3 = 3,
+  TRACE4 = 4,
+  DEBUG = 5,
+  DEBUG2 = 6,
+  DEBUG3 = 7,
+  DEBUG4 = 8,
+  INFO = 9,
+  INFO2 = 10,
+  INFO3 = 11,
+  INFO4 = 12,
+  WARN = 13,
+  WARN2 = 14,
+  WARN3 = 15,
+  WARN4 = 16,
+  ERROR = 17,
+  ERROR2 = 18,
+  ERROR3 = 19,
+  ERROR4 = 20,
+  FATAL = 21,
+  FATAL2 = 22,
+  FATAL3 = 23,
+  FATAL4 = 24,
+}
+
 export interface LogRecord {
   /**
    * The time when the log record occurred as UNIX Epoch time in nanoseconds.
@@ -25,7 +53,7 @@ export interface LogRecord {
   /**
    * Numerical value of the severity.
    */
-  severityNumber?: number;
+  severityNumber?: SeverityNumber;
 
   /**
    * The severity text.
diff --git a/experimental/packages/api-logs/test/noop-implementations/noop-logger.test.ts b/experimental/packages/api-logs/test/noop-implementations/noop-logger.test.ts
index 6360e7b7dd..85537d59f0 100644
--- a/experimental/packages/api-logs/test/noop-implementations/noop-logger.test.ts
+++ b/experimental/packages/api-logs/test/noop-implementations/noop-logger.test.ts
@@ -15,6 +15,7 @@
  */
 
 import * as assert from 'assert';
+import { SeverityNumber } from '../../src';
 import { NoopLogger } from '../../src/NoopLogger';
 import { NoopLoggerProvider } from '../../src/NoopLoggerProvider';
 
@@ -31,6 +32,9 @@ describe('NoopLogger', () => {
 
   it('calling emitLogRecord should not crash', () => {
     const logger = new NoopLoggerProvider().getLogger('test-noop');
-    logger.emitLogRecord({ severityNumber: 1, body: 'log body' });
+    logger.emitLogRecord({
+      severityNumber: SeverityNumber.TRACE,
+      body: 'log body',
+    });
   });
 });