AbstractAccording to Spinoza mental events and physical events are identical. What makes Spinoza's identity theory tempting is that it solves the problem of mind body interaction rather elegantly: mental events and physical events can be causally related to each other because mental events are physical events.However, Spinoza seems to deny that there is any causal interaction between mental and physical events. My aim is to show that Spinoza's apparent denial of mind body interaction can be reconciled with the identity theory. I argue that Spinoza had both an extensional and an intensional concept of cause and when Spinoza seems to deny mind body interaction he is having in mind the intensional concept of cause. This intensional concept of cause corresponds to that of causal explanation. I will argue that Spinoza anticipated Donald Davidson's view that even though mental events cannot be explained by referring to physical events andvice versa, mental and physical events are causally related to each other.