[Revised entry by Michael McKenna and D. Justin Coates on April 16, 2024. Changes to: Bibliography, supplement.htmlChanges to: Main text, Bibliography] Compatibilism offers a solution to the free will problem, which concerns a disputed incompatibility between free will and determinism. Compatibilism is the thesis that free will is compatible with determinism. Because free will is typically taken to be a necessary condition of moral responsibility, compatibilism is sometimes expressed as a thesis about the compatibility between moral responsibility and determinism....