FAIRGAME is a framework that utilizes game theory to identify bias in AI agents. It is used to uncover biased outcomes in popular games, based on various LLMs and languages, the agent's personality traits, or strategic knowledge. It provides a reproducible, standardized, and user-friendly IT framework to interpret AI agent interactions and compare results. Users can easily simulate desired games and scenarios and compare simulation results with game-theoretic predictions to systematically uncover biases, predict new behaviors arising from strategic interactions, and enable further research on strategic decision-making using LLM agents.