Crinis was a Stoic philosopher active during the Hellenistic period, most likely in the late 3rd or 2nd century BCE. He is identified as a disciple of the influential Stoic thinker Chrysippus. Beyond this association, no details of his life or birthplace are known.

He is credited with writing one known work, a book on logic titled The Art of Dialectic. This text, which is now lost, focused on the Stoic analysis of propositions, or "axioms." According to later sources, Crinis defined an axiom as a complete statement that is self-sufficient and can be judged as true or false. This definition placed him within specialized debates among Stoic philosophers about language and logic.

Crinis's historical importance is narrow but clear. He is remembered as a minor contributor to the formal development of Stoic logic in the generations after the school's founding. His surviving definition is recorded alongside those of more prominent Stoics, indicating that his views were considered part of the school's ongoing technical discussions. His work represents the continued refinement of philosophical terminology within the Stoic tradition.