A crowbar, also called about 10 other names, is a tool consisting of a metal bar with a single curved end and flattened points, often with a small fissure on one or both ends for removing nails.

It is used as a lever either to force apart two objects or to remove nails. Crowbars are commonly used to open nailed wooden crates, remove nails, or pry apart boards. Crowbars can be used as any of the three lever classes but the curved end is usually used as a first-class lever, and the flat end as a second class lever. In mining, crowbars are used to break and remove rock, but not as much in modern mining.