diff --git a/docs/mdbook/configuration/README.md b/docs/mdbook/configuration/README.md
index 36fec6234..4c868cbf3 100644
--- a/docs/mdbook/configuration/README.md
+++ b/docs/mdbook/configuration/README.md
@@ -19,6 +19,10 @@ Lefthook supports the following file names for the main config:
 | JSON  | `lefthook.json` |
 | JSON  | `.lefthook.json` |
 | JSON  | `.config/lefthook.json` |
+|       |              |
+| JSONC | `lefthook.jsonc` |
+| JSONC | `.lefthook.jsonc` |
+| JSONC | `.config/lefthook.jsonc` |
 
 If there are more than 1 file in the project, only one will be used, and you'll never know which one. So, please, use one format in a project.
 
diff --git a/go.mod b/go.mod
index ab1a892cc..e2e737430 100644
--- a/go.mod
+++ b/go.mod
@@ -52,6 +52,7 @@ require (
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/tidwall/jsonc v0.3.2 // indirect
 	github.com/wk8/go-ordered-map/v2 v2.1.8 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
 	golang.org/x/tools v0.39.0 // indirect
diff --git a/go.sum b/go.sum
index 0dc07ca29..33caf1d22 100644
--- a/go.sum
+++ b/go.sum
@@ -109,6 +109,8 @@ github.com/spf13/afero v1.15.0 h1:b/YBCLWAJdFWJTN9cLhiXXcD7mzKn9Dm86dNnfyQw1I=
 github.com/spf13/afero v1.15.0/go.mod h1:NC2ByUVxtQs4b3sIUphxK0NioZnmxgyCrfzeuq8lxMg=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
+github.com/tidwall/jsonc v0.3.2 h1:ZTKrmejRlAJYdn0kcaFqRAKlxxFIC21pYq8vLa4p2Wc=
+github.com/tidwall/jsonc v0.3.2/go.mod h1:dw+3CIxqHi+t8eFSpzzMlcVYxKp08UP5CD8/uSFCyJE=
 github.com/urfave/cli/v3 v3.6.1 h1:j8Qq8NyUawj/7rTYdBGrxcH7A/j7/G8Q5LhWEW4G3Mo=
 github.com/urfave/cli/v3 v3.6.1/go.mod h1:ysVLtOEmg2tOy6PknnYVhDoouyC/6N42TMeoMzskhso=
 github.com/wk8/go-ordered-map/v2 v2.1.8 h1:5h/BUHu93oj4gIdvHHHGsScSTMijfx5PeYkE/fJgbpc=
diff --git a/internal/command/install.go b/internal/command/install.go
index ba8da14f7..72b4acb99 100644
--- a/internal/command/install.go
+++ b/internal/command/install.go
@@ -99,9 +99,7 @@ func (l *Lefthook) findMainConfig(path string) (string, error) {
 	}
 
 	for _, name := range config.MainConfigNames {
-		for _, extension := range []string{
-			".yml", ".yaml", ".toml", ".json",
-		} {
+		for _, extension := range config.Extensions {
 			configPath := filepath.Join(path, name+extension)
 			if ok, _ := afero.Exists(l.fs, configPath); ok {
 				return configPath, nil
diff --git a/internal/config/jsonc_parser.go b/internal/config/jsonc_parser.go
new file mode 100644
index 000000000..7d9f19ae4
--- /dev/null
+++ b/internal/config/jsonc_parser.go
@@ -0,0 +1,26 @@
+package config
+
+import (
+	"encoding/json"
+
+	"github.com/tidwall/jsonc"
+)
+
+type JSONC struct{}
+
+func jsoncParser() *JSONC {
+	return &JSONC{}
+}
+
+func (p *JSONC) Unmarshal(b []byte) (map[string]any, error) {
+	var out map[string]any
+	if err := json.Unmarshal(jsonc.ToJSON(b), &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// Marshal marshals the given config map to JSON bytes.
+func (p *JSONC) Marshal(o map[string]any) ([]byte, error) {
+	return json.Marshal(o)
+}
diff --git a/internal/config/load.go b/internal/config/load.go
index 5209d7d9c..fb0894ec6 100644
--- a/internal/config/load.go
+++ b/internal/config/load.go
@@ -32,17 +32,19 @@ var (
 	hookKeyRegexp    = regexp.MustCompile(`^(?P<hookName>[^.]+)\.(?:scripts|commands|jobs)`)
 	LocalConfigNames = []string{"lefthook-local", ".lefthook-local", filepath.Join(".config", "lefthook-local")}
 	MainConfigNames  = []string{"lefthook", ".lefthook", filepath.Join(".config", "lefthook")}
-	extensions       = []string{
+	Extensions       = []string{
 		".yml",
 		".yaml",
 		".json",
+		".jsonc",
 		".toml",
 	}
 	parsers = map[string]koanf.Parser{
-		".yml":  yaml.Parser(),
-		".yaml": yaml.Parser(),
-		".json": json.Parser(),
-		".toml": toml.Parser(),
+		".yml":   yaml.Parser(),
+		".yaml":  yaml.Parser(),
+		".json":  json.Parser(),
+		".jsonc": jsoncParser(),
+		".toml":  toml.Parser(),
 	}
 
 	mergeJobsOption = koanf.WithMergeFunc(mergeJobs)
@@ -70,7 +72,7 @@ func loadConfig(k *koanf.Koanf, filesystem afero.Fs, path string) error {
 
 // loadFirst loads the first existing config from given names and supported extensions.
 func loadFirst(k *koanf.Koanf, filesystem afero.Fs, root string, names []string) error {
-	for _, extension := range extensions {
+	for _, extension := range Extensions {
 		for _, name := range names {
 			config := filepath.Join(root, name+extension)
 			if ok, _ := afero.Exists(filesystem, config); !ok {
@@ -90,7 +92,7 @@ func loadFirstMain(k *koanf.Koanf, filesystem afero.Fs, root string) error {
 	if ok := errors.As(err, &ConfigNotFoundError{}); ok {
 		var hasLocalConfig bool
 	OUT:
-		for _, extension := range extensions {
+		for _, extension := range Extensions {
 			for _, name := range LocalConfigNames {
 				if ok, _ := afero.Exists(filesystem, filepath.Join(root, name+extension)); ok {
 					hasLocalConfig = true
diff --git a/tests/integration/run_jsonc.txt b/tests/integration/run_jsonc.txt
new file mode 100644
index 000000000..9322c5a17
--- /dev/null
+++ b/tests/integration/run_jsonc.txt
@@ -0,0 +1,22 @@
+exec git init
+exec git config user.email "you@example.com"
+exec git config user.name "Your Name"
+exec git add -A
+exec lefthook install
+exec git commit -m 'test'
+stderr '\s*Hi there from Lefthook\s*'
+
+-- lefthook.jsonc --
+{
+  /* Prints only what's being executed */
+  "output": [
+    "execution"
+  ],
+  "pre-commit": {
+    "commands": {
+      "echo": {
+        "run": "echo Hi there from Lefthook" // echoes Hi there from Lefthook
+      }
+    }
+  }
+}