diff --git a/nac_validate/cli/main.py b/nac_validate/cli/main.py
index 198c79e..fb19fd5 100644
--- a/nac_validate/cli/main.py
+++ b/nac_validate/cli/main.py
@@ -123,6 +123,16 @@ def version_callback(value: bool) -> None:
 ]
 
 
+DisableYamllint = Annotated[
+    bool,
+    typer.Option(
+        "--disable-yamllint",
+        help="Disable yamllint validation.",
+        envvar="NAC_VALIDATE_DISABLE_YAMLLINT",
+    ),
+]
+
+
 Version = Annotated[
     bool,
     typer.Option(
@@ -142,13 +152,16 @@ def main(
     rules: Rules = DEFAULT_RULES,
     output: Output = None,
     non_strict: NonStrict = False,
+    disable_yamllint: DisableYamllint = False,
     version: Version = False,
 ) -> None:
     """A CLI tool to perform syntactic and semantic validation of YAML files."""
     configure_logging(verbosity)
 
     try:
-        validator = nac_validate.validator.Validator(schema, rules)
+        validator = nac_validate.validator.Validator(
+            schema, rules, enable_yamllint=not disable_yamllint
+        )
         validator.validate_syntax(paths, not non_strict)
         validator.validate_semantics(paths)
         if output:
diff --git a/nac_validate/validator.py b/nac_validate/validator.py
index 4bac414..063665d 100644
--- a/nac_validate/validator.py
+++ b/nac_validate/validator.py
@@ -12,6 +12,8 @@
 from typing import Any
 
 import yamale
+import yamllint.config
+import yamllint.linter
 from nac_yaml.yaml import load_yaml_files, write_yaml_file
 from ruamel import yaml
 from yamale.yamale_error import YamaleError
@@ -29,7 +31,10 @@
 
 
 class Validator:
-    def __init__(self, schema_path: Path, rules_path: Path):
+    def __init__(
+        self, schema_path: Path, rules_path: Path, enable_yamllint: bool = False
+    ):
+        self.enable_yamllint = enable_yamllint
         self.data: dict[str, Any] | None = None
         self.schema = None
         if os.path.exists(schema_path):
@@ -71,6 +76,39 @@ def __init__(self, schema_path: Path, rules_path: Path):
                 f"Rules directory not found: {rules_path}"
             )
 
+    def _run_yamllint(self, file_path: Path) -> None:
+        """Run yamllint validation on a file"""
+        if file_path.suffix not in [".yaml", ".yml"]:
+            return
+
+        logger.debug(f"Running yamllint on {file_path}")
+
+        try:
+            # NAC-specific yamllint configuration - only new-lines validation enabled
+            config_str = "{extends: default, rules: {anchors: disable, braces: disable, brackets: disable, colons: disable, commas: disable, comments: disable, comments-indentation: disable, document-end: disable, document-start: disable, empty-lines: disable, empty-values: disable, float-values: disable, hyphens: disable, indentation: disable, key-duplicates: disable, key-ordering: disable, line-length: disable, new-line-at-end-of-file: disable, new-lines: enable, octal-values: disable, quoted-strings: disable, trailing-spaces: disable, truthy: disable}}"
+            config = yamllint.config.YamlLintConfig(config_str)
+
+            # Read file as bytes to preserve original line endings
+            with open(file_path, "rb") as f:
+                content = f.read()
+
+            problems = yamllint.linter.run(content, config, file_path)
+            problem_list = list(problems)
+
+            logger.debug(f"Yamllint found {len(problem_list)} problems")
+
+            if problem_list:
+                # Log yamllint problems but don't block other validations
+                for problem in problem_list:
+                    msg = f"Yamllint error: {file_path}:{problem.line}:{problem.column}: {problem.message} ({problem.rule})"
+                    logger.error(msg)
+                    # Note: NOT adding to self.errors to allow other validations to continue
+
+        except ImportError:
+            logger.warning("yamllint not installed - skipping yamllint validation")
+        except Exception as e:
+            logger.warning(f"yamllint validation failed for {file_path}: {e}")
+
     def _validate_syntax_file(self, file_path: Path, strict: bool = True) -> None:
         """Run syntactic validation for a single file"""
         if os.path.isfile(file_path) and file_path.suffix in [".yaml", ".yml"]:
@@ -107,6 +145,10 @@ def _validate_syntax_file(self, file_path: Path, strict: bool = True) -> None:
                         logger.error(msg)
                         self.errors.append(msg)
 
+            # Run yamllint after other validations (if enabled)
+            if self.enable_yamllint:
+                self._run_yamllint(file_path)
+
     def _get_named_path(self, data: dict[str, Any], path: str) -> str:
         """Convert a numeric path to a named path for better error messages."""
         path_segments = path.split(".")
diff --git a/pyproject.toml b/pyproject.toml
index b12ac57..b6b0c86 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,6 +31,7 @@ dependencies = [
     "typer>=0.17.4",
     "yamale>=6.0.0",
     "jmespath>=1.0.0",
+    "yamllint>=1.38.0",
 ]
 
 [project.urls]