diff --git a/README.md b/README.md
index 4bf712f..e53603f 100644
--- a/README.md
+++ b/README.md
@@ -349,6 +349,7 @@ Currently, supported CI are here:
 - Drone
 - Jenkins
 - GitLab CI
+- GitHub Actions
 
 ### Private Repository Considerations
 GitHub private repositories require the `repo` and `write:discussion` permissions.
diff --git a/ci.go b/ci.go
index 7d48d8e..36f3794 100644
--- a/ci.go
+++ b/ci.go
@@ -136,3 +136,13 @@ func gitlabci() (ci CI, err error) {
 	ci.PR.Number, err = strconv.Atoi(pr)
 	return ci, err
 }
+
+func githubActions() (ci CI, err error) {
+	ci.URL = fmt.Sprintf(
+		"https://github.com/%s/runs/%s",
+		os.Getenv("GITHUB_REPOSITORY"),
+		os.Getenv("GITHUB_RUN_ID"),
+	)
+	ci.PR.Revision = os.Getenv("GITHUB_SHA")
+	return ci, err
+}
diff --git a/ci_test.go b/ci_test.go
index ceb286e..8966268 100644
--- a/ci_test.go
+++ b/ci_test.go
@@ -707,3 +707,55 @@ func TestGitLabCI(t *testing.T) {
 		}
 	}
 }
+
+func TestGitHubActions(t *testing.T) {
+	envs := []string{
+		"GITHUB_SHA",
+		"GITHUB_REPOSITORY",
+		"GITHUB_RUN_ID",
+	}
+	saveEnvs := make(map[string]string)
+	for _, key := range envs {
+		saveEnvs[key] = os.Getenv(key)
+		os.Unsetenv(key)
+	}
+	defer func() {
+		for key, value := range saveEnvs {
+			os.Setenv(key, value)
+		}
+	}()
+
+	// https://help.github.com/ja/actions/configuring-and-managing-workflows/using-environment-variables
+	testCases := []struct {
+		fn func()
+		ci CI
+		ok bool
+	}{
+		{
+			fn: func() {
+				os.Setenv("GITHUB_SHA", "abcdefg")
+				os.Setenv("GITHUB_REPOSITORY", "mercari/tfnotify")
+				os.Setenv("GITHUB_RUN_ID", "12345")
+			},
+			ci: CI{
+				PR: PullRequest{
+					Revision: "abcdefg",
+					Number: 0,
+				},
+				URL: "https://github.com/mercari/tfnotify/runs/12345",
+			},
+			ok: true,
+		},
+	}
+
+	for _, testCase := range testCases {
+		testCase.fn()
+		ci, err := githubActions()
+		if !reflect.DeepEqual(ci, testCase.ci) {
+			t.Errorf("got %q but want %q", ci, testCase.ci)
+		}
+		if (err == nil) != testCase.ok {
+			t.Errorf("got error %q", err)
+		}
+	}
+}
diff --git a/config/config.go b/config/config.go
index b8fe115..ad9e62f 100644
--- a/config/config.go
+++ b/config/config.go
@@ -125,6 +125,8 @@ func (cfg *Config) Validation() error {
 		// ok pattern
 	case "jenkins":
 		// ok pattern
+	case "github-actions":
+		// ok pattern
 	default:
 		return fmt.Errorf("%s: not supported yet", cfg.CI)
 	}
diff --git a/main.go b/main.go
index c17c29e..e031976 100644
--- a/main.go
+++ b/main.go
@@ -77,6 +77,11 @@ func (t *tfnotify) Run() error {
 		if err != nil {
 			return err
 		}
+	case "github-actions":
+		ci, err = githubActions()
+		if err != nil {
+			return err
+		}
 	case "":
 		return fmt.Errorf("CI service: required (e.g. circleci)")
 	default: