diff --git a/src/repohealth/analyzers/git_analyzer.py b/src/repohealth/analyzers/git_analyzer.py
new file mode 100644
index 0000000..1cd6c88
--- /dev/null
+++ b/src/repohealth/analyzers/git_analyzer.py
@@ -0,0 +1,230 @@
+"""Git repository analyzer using GitPython."""
+
+import os
+from pathlib import Path
+from typing import Optional, Generator
+from datetime import datetime
+
+from git import Repo, Commit, Diff
+from git.exc import InvalidGitRepositoryError, NoSuchPathError
+
+from repohealth.models.file_stats import FileAnalysis
+from repohealth.models.author import AuthorStats
+
+
+class GitAnalyzer:
+    """Analyzer for Git repository commit and authorship data."""
+
+    def __init__(self, repo_path: str):
+        """Initialize the analyzer with a repository path.
+
+        Args:
+            repo_path: Path to the Git repository.
+        """
+        self.repo_path = Path(repo_path)
+        self.repo: Optional[Repo] = None
+        self._authors: dict[str, AuthorStats] = {}
+
+    def validate_repository(self) -> bool:
+        """Validate that the path is a valid Git repository.
+
+        Returns:
+            True if valid, False otherwise.
+        """
+        try:
+            self.repo = Repo(self.repo_path)
+            return not self.repo.bare
+        except (InvalidGitRepositoryError, NoSuchPathError):
+            return False
+
+    def get_commit_count(self) -> int:
+        """Get total commit count in the repository.
+
+        Returns:
+            Total number of commits.
+        """
+        if not self.repo:
+            return 0
+        return len(list(self.repo.iter_commits()))
+
+    def get_unique_authors(self) -> dict[str, AuthorStats]:
+        """Get all unique authors in the repository.
+
+        Returns:
+            Dictionary mapping author email to AuthorStats.
+        """
+        if not self.repo:
+            return {}
+
+        authors = {}
+        for commit in self.repo.iter_commits():
+            author_key = commit.author.email
+            if author_key not in authors:
+                authors[author_key] = AuthorStats(
+                    name=commit.author.name,
+                    email=commit.author.email
+                )
+            authors[author_key].total_commits += 1
+            if not authors[author_key].first_commit:
+                authors[author_key].first_commit = commit.authored_datetime
+            authors[author_key].last_commit = commit.authored_datetime
+
+        self._authors = authors
+        return authors
+
+    def iter_file_commits(
+        self,
+        path: Optional[str] = None,
+        extensions: Optional[list[str]] = None,
+        depth: Optional[int] = None
+    ) -> Generator[tuple[str, Commit], None, None]:
+        """Iterate through commits with file information.
+
+        Args:
+            path: Optional path to filter files.
+            extensions: Optional list of file extensions to include.
+            depth: Optional limit on commit history depth.
+
+        Yields:
+            Tuples of (file_path, commit).
+        """
+        if not self.repo:
+            return
+
+        commit_count = 0
+        for commit in self.repo.iter_commits():
+            if depth and commit_count >= depth:
+                break
+
+            try:
+                for file_data in commit.stats.files.keys():
+                    if path and not file_data.startswith(path):
+                        continue
+                    if extensions:
+                        ext = Path(file_data).suffix.lstrip('.')
+                        if ext not in extensions:
+                            continue
+                    yield file_data, commit
+            except (ValueError, KeyError):
+                continue
+
+            commit_count += 1
+
+    def analyze_file_authors(
+        self,
+        file_path: str,
+        depth: Optional[int] = None
+    ) -> FileAnalysis:
+        """Analyze authorship for a single file.
+
+        Args:
+            file_path: Path to the file.
+            depth: Optional limit on commit history depth.
+
+        Returns:
+            FileAnalysis with authorship statistics.
+        """
+        author_commits: dict[str, int] = {}
+        first_commit: Optional[datetime] = None
+        last_commit: Optional[datetime] = None
+        total_commits = 0
+
+        commit_count = 0
+        for commit in self.repo.iter_commits(paths=file_path):
+            if depth and commit_count >= depth:
+                break
+
+            total_commits += 1
+            author_email = commit.author.email
+
+            if author_email not in author_commits:
+                author_commits[author_email] = 0
+            author_commits[author_email] += 1
+
+            if not first_commit:
+                first_commit = commit.authored_datetime
+            last_commit = commit.authored_datetime
+
+            commit_count += 1
+
+        module = str(Path(file_path).parent)
+        extension = Path(file_path).suffix.lstrip('.')
+
+        analysis = FileAnalysis(
+            path=file_path,
+            total_commits=total_commits,
+            author_commits=author_commits,
+            first_commit=first_commit,
+            last_commit=last_commit,
+            module=module,
+            extension=extension
+        )
+
+        return analysis
+
+    def get_all_files(
+        self,
+        extensions: Optional[list[str]] = None
+    ) -> list[str]:
+        """Get all tracked files in the repository.
+
+        Args:
+            extensions: Optional list of file extensions to include.
+
+        Returns:
+            List of file paths.
+        """
+        if not self.repo:
+            return []
+
+        files = []
+        for item in self.repo.tree().traverse():
+            if item.type == 'blob':
+                if extensions:
+                    ext = Path(item.path).suffix.lstrip('.')
+                    if ext in extensions:
+                        files.append(item.path)
+                else:
+                    files.append(item.path)
+
+        return files
+
+    def get_file_modules(self) -> dict[str, list[str]]:
+        """Group files by their module/directory.
+
+        Returns:
+            Dictionary mapping module to list of files.
+        """
+        files = self.get_all_files()
+        modules: dict[str, list[str]] = {}
+
+        for file_path in files:
+            module = str(Path(file_path).parent)
+            if module not in modules:
+                modules[module] = []
+            modules[module].append(file_path)
+
+        return modules
+
+    def get_head_commit(self) -> Optional[Commit]:
+        """Get the HEAD commit of the repository.
+
+        Returns:
+            HEAD Commit or None if repository is empty.
+        """
+        if not self.repo:
+            return None
+        try:
+            return self.repo.head.commit
+        except ValueError:
+            return None
+
+    def get_branch_count(self) -> int:
+        """Get the number of branches in the repository.
+
+        Returns:
+            Number of branches.
+        """
+        if not self.repo:
+            return 0
+        return len(list(self.repo.branches))