diff --git a/project_scaffold_cli/gitignore.py b/project_scaffold_cli/gitignore.py
new file mode 100644
index 0000000..4cc5397
--- /dev/null
+++ b/project_scaffold_cli/gitignore.py
@@ -0,0 +1,203 @@
+"""Gitignore generator for Project Scaffold CLI."""
+
+import os
+from pathlib import Path
+from typing import Dict, Optional, Set
+
+
+class GitignoreGenerator:
+    """Generate language-specific .gitignore files."""
+
+    SUPPORTED_LANGUAGES = ["python", "nodejs", "go", "rust"]
+
+    GITIGNORE_TEMPLATES = {
+        "python": """__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+venv/
+ENV/
+env/
+.venv/
+.pytest_cache/
+.coverage
+.coverage.*
+htmlcov/
+.tox/
+.nox/
+*.manifest
+*.spec
+""",
+        "nodejs": """node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+*.log
+.DS_Store
+dist/
+build/
+.nyc_output/
+coverage/
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
+""",
+        "go": """# Binaries
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary
+*.test
+
+# Output of go coverage
+*.out
+
+# Go workspace
+go.work
+
+# Vendor directory
+vendor/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+""",
+        "rust": """# Cargo
+target/
+Cargo.lock
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# Backup files
+*~
+#*#
+#*
+.backup
+
+# Build artifacts
+*.rlib
+*.dylib
+*.dll
+
+# IDE
+.vscode/
+.idea/
+""",
+    }
+
+    ADDITIONAL_PATTERNS = {
+        "python": """*.pyc
+*.pyo
+.env
+.env.local
+.vscode/
+.idea/
+""",
+        "nodejs": """package-lock.json
+yarn.lock
+.env
+.env.local
+""",
+        "go": """*.out
+*.test
+coverage.txt
+""",
+        "rust": """**/*.rs.bk
+Cargo.lock
+""",
+    }
+
+    def __init__(self):
+        self.templates_dir = self._get_templates_dir()
+
+    def _get_templates_dir(self) -> Path:
+        """Get the directory containing gitignore templates."""
+        return Path(__file__).parent / "templates" / "gitignore"
+
+    def generate(
+        self, language: str, output_path: Path, extra_patterns: Optional[Set[str]] = None
+    ) -> None:
+        """Generate a .gitignore file for the specified language."""
+        if language not in self.SUPPORTED_LANGUAGES:
+            raise ValueError(
+                f"Unsupported language: {language}. "
+                f"Supported: {', '.join(self.SUPPORTED_LANGUAGES)}"
+            )
+
+        content = self.GITIGNORE_TEMPLATES.get(language, "")
+
+        extra = self.ADDITIONAL_PATTERNS.get(language, "")
+        if extra:
+            content += extra
+
+        if extra_patterns:
+            content += "\n".join(sorted(extra_patterns)) + "\n"
+
+        content += "\n# Editor directories\n.idea/\n.vscode/\n*.swp\n*.swo\n*~\n"
+
+        output_path.write_text(content)
+
+    def generate_from_template(self, template_name: str, output_path: Path) -> None:
+        """Generate .gitignore from a template file."""
+        template_path = self.templates_dir / template_name
+        if not template_path.exists():
+            raise FileNotFoundError(
+                f"Gitignore template not found: {template_path}"
+            )
+
+        content = template_path.read_text()
+        output_path.write_text(content)
+
+    def list_available_templates(self) -> list[str]:
+        """List available gitignore templates."""
+        if not self.templates_dir.exists():
+            return []
+
+        return [
+            f.stem
+            for f in self.templates_dir.iterdir()
+            if f.is_file() and f.suffix in (".gitignore", ".txt", "")
+        ]
+
+    def get_template_content(self, language: str) -> str:
+        """Get the raw template content for a language."""
+        return self.GITIGNORE_TEMPLATES.get(language, "")
+
+    def append_patterns(self, gitignore_path: Path, patterns: Set[str]) -> None:
+        """Append additional patterns to an existing .gitignore file."""
+        if gitignore_path.exists():
+            content = gitignore_path.read_text()
+            if not content.endswith("\n"):
+                content += "\n"
+        else:
+            content = ""
+
+        content += "\n" + "\n".join(sorted(patterns)) + "\n"
+        gitignore_path.write_text(content)