A regularity is where one kind of thing is associated with or followed by another kind of thing. ‘Regularity: causation without connection?’ shows that types of events, actions, or states seem to come in pairs where if we have the first, we have the second. Why do we have these regular associations of types of event? It is because the first type of event is a cause of the second. But do we have good grounds to say this? Does causation explain regularity? David Hume's constant conjunction account, repetition, causes, coincidences, and regularity theory are all discussed.