diff --git a/docs/guides/2-cli.md b/docs/guides/2-cli.md
index f38944c80..7bfd2e5ab 100644
--- a/docs/guides/2-cli.md
+++ b/docs/guides/2-cli.md
@@ -33,7 +33,8 @@ Other options include:
           [string] [choices: "utf8", "ascii", "utf-8", "utf16le", "ucs2", "ucs-2", "base64", "latin1"] [default: "utf8"]
   -f, --format                   formatters to use for outputting results, more than one can be given joining them with
                                  a comma
-               [string] [choices: "json", "stylish", "junit", "html", "text", "teamcity", "pretty"] [default: "stylish"]
+        [string] [choices: "json", "stylish", "junit", "html", "text", "teamcity", "pretty", "github-actions"] [default:
+                                                                                                              "stylish"]
   -o, --output                   where to output results, can be a single file name, multiple "output.<format>" or
                                  missing to print to stdout                                                     [string]
       --stdin-filepath           path to a file to pretend that stdin comes from                                [string]
diff --git a/packages/formatters/README.md b/packages/formatters/README.md
index cc2dfa53c..ebade72f6 100644
--- a/packages/formatters/README.md
+++ b/packages/formatters/README.md
@@ -32,3 +32,4 @@ console.error(output);
 ### Node.js only
 
 - pretty
+- github-actions
diff --git a/packages/formatters/src/__tests__/github-actions.test.ts b/packages/formatters/src/__tests__/github-actions.test.ts
new file mode 100644
index 000000000..c81d76fec
--- /dev/null
+++ b/packages/formatters/src/__tests__/github-actions.test.ts
@@ -0,0 +1,50 @@
+import { DiagnosticSeverity } from '@stoplight/types';
+import type { IRuleResult } from '@stoplight/spectral-core';
+import { githubActions } from '../github-actions';
+
+const cwd = process.cwd();
+const results: IRuleResult[] = [
+  {
+    code: 'operation-description',
+    message: 'paths./pets.get.description is not truthy\nMessage can have\nmultiple lines',
+    path: ['paths', '/pets', 'get', 'description'],
+    severity: 1,
+    source: `${cwd}/__tests__/fixtures/petstore.oas2.yaml`,
+    range: {
+      start: {
+        line: 60,
+        character: 8,
+      },
+      end: {
+        line: 71,
+        character: 60,
+      },
+    },
+  },
+  {
+    code: 'operation-tags',
+    message: 'paths./pets.get.tags is not truthy',
+    path: ['paths', '/pets', 'get', 'tags'],
+    severity: 1,
+    source: `${cwd}/__tests__/fixtures/petstore.oas2.yaml`,
+    range: {
+      start: {
+        line: 60,
+        character: 8,
+      },
+      end: {
+        line: 71,
+        character: 60,
+      },
+    },
+  },
+];
+
+describe('GitHub Actions formatter', () => {
+  test('should be formatted correctly', () => {
+    expect(githubActions(results, { failSeverity: DiagnosticSeverity.Error }).split('\n')).toEqual([
+      '::warning title=operation-description,file=__tests__/fixtures/petstore.oas2.yaml,col=9,endColumn=61,line=61,endLine=72::paths./pets.get.description is not truthy%0AMessage can have%0Amultiple lines',
+      '::warning title=operation-tags,file=__tests__/fixtures/petstore.oas2.yaml,col=9,endColumn=61,line=61,endLine=72::paths./pets.get.tags is not truthy',
+    ]);
+  });
+});
diff --git a/packages/formatters/src/github-actions.ts b/packages/formatters/src/github-actions.ts
new file mode 100644
index 000000000..f09b43adf
--- /dev/null
+++ b/packages/formatters/src/github-actions.ts
@@ -0,0 +1,47 @@
+import { relative } from '@stoplight/path';
+import { DiagnosticSeverity, Dictionary } from '@stoplight/types';
+import { Formatter } from './types';
+
+const OUTPUT_TYPES: Dictionary<string, DiagnosticSeverity> = {
+  [DiagnosticSeverity.Error]: 'error',
+  [DiagnosticSeverity.Warning]: 'warning',
+  [DiagnosticSeverity.Information]: 'notice',
+  [DiagnosticSeverity.Hint]: 'notice',
+};
+
+type OutputParams = {
+  title?: string;
+  file: string;
+  col?: number;
+  endColumn?: number;
+  line?: number;
+  endLine?: number;
+};
+
+export const githubActions: Formatter = results => {
+  return results
+    .map(result => {
+      // GitHub Actions requires relative path for annotations, determining from working directory here
+      const file = relative(process.cwd(), result.source ?? '');
+      const params: OutputParams = {
+        title: result.code.toString(),
+        file,
+        col: result.range.start.character + 1,
+        endColumn: result.range.end.character + 1,
+        line: result.range.start.line + 1,
+        endLine: result.range.end.line + 1,
+      };
+
+      const paramsString = Object.entries(params)
+        .map(p => p.join('='))
+        .join(',');
+
+      // As annotated messages must be one-line due to GitHub's limitation, replacing all LF to %0A here.
+      // see: https://github.com/actions/toolkit/issues/193
+      // FIXME: Use replaceAll instead after removing Node.js 14 support.
+      const message = result.message.replace(/\n/g, '%0A');
+
+      return `::${OUTPUT_TYPES[result.severity]} ${paramsString}::${message}`;
+    })
+    .join('\n');
+};
diff --git a/packages/formatters/src/index.node.ts b/packages/formatters/src/index.node.ts
index bbb40b065..d9e9b3ce2 100644
--- a/packages/formatters/src/index.node.ts
+++ b/packages/formatters/src/index.node.ts
@@ -1,3 +1,4 @@
 export { html, json, junit, text, stylish, teamcity } from './index';
 export type { Formatter, FormatterOptions } from './index';
 export { pretty } from './pretty';
+export { githubActions } from './github-actions';
diff --git a/packages/formatters/src/index.ts b/packages/formatters/src/index.ts
index 4c3b90e34..8caf77087 100644
--- a/packages/formatters/src/index.ts
+++ b/packages/formatters/src/index.ts
@@ -10,3 +10,7 @@ export type { Formatter, FormatterOptions } from './types';
 export const pretty: Formatter = () => {
   throw Error('pretty formatter is available only in Node.js');
 };
+
+export const githubActions: Formatter = () => {
+  throw Error('github-actions formatter is available only in Node.js');
+};