A crew cut is a type of haircut in which the upright hair on the top of the head is cut relatively short, graduated in length from the longest hair that forms a short pomp (pompadour) at the front hairline to the shortest at the back of the crown so that in side profile, the outline of the top hair approaches the horizontal. Relative to the front view, and to varying degrees, the outline of the top hair can be arched or flattened at the short pomp front and rounded or flattened over the rest of the top to complement the front hairline, head shape, face shape and facial features. The hair on the sides and back of the head is usually tapered short, semi-short, or medium.

A short crew cut is sometimes referred to as a butch, though with the exception of variant forms, a butch differs from a crew cut in that the top hair is cut a uniform short length. A long crew cut can be referred to in the US as an ivy league crew cut or ivy league. A crew cut where the hair on the top of the head is graduated in length from the front hairline to a chosen point on the mid to back part of the crown as a flat plane, of level, upward sloping or downward sloping inclination is known as a flat top crew cut or flattop. The crew cut, flat top crew cut, butch cut and Ivy League haircut can be referred to as types of buzz cuts. These haircuts have become popular military-inspired styles for men who want a short and low-maintenance look.