 After a biographical note (section 1), this entry surveys Salmon’s views on probability (section 2), confirmation (section 3), space and time (section 4), explanation and causality (section 5), rationality and realism (section 6). Albeit necessary in this kind of essay, such partitioning is somewhat artificial, because Salmon’s ideas are strictly interconnected: his conception of causal explanation relies on his frequency view of probability and substantiates a concept of rationality that regards causal knowledge of phenomena as crucial for our understanding of both the world and human action.