A bicycle helmet is a type of helmet designed to attenuate impacts to the head of a cyclist in collisions while minimizing side effects such as interference with peripheral vision.

A helmet is a form of protective gear worn to protect the head. More specifically, a helmet complements the skull in protecting the human brain. Ceremonial or symbolic helmets without protective function are sometimes worn. Soldiers wear combat helmets, often made from Kevlar or other lightweight synthetic fibers.