In the United States and Canada, a jock is a stereotype of an athlete, or someone who is primarily interested in sports and sports culture, and does not take much interest in intellectual activity. It is generally applied mostly to high school and college athletics participants who form a distinct youth subculture. As a blanket term, jock can be considered synonymous with athlete. Jocks are usually presented as male practitioners of team sports such as American football, basketball, baseball, lacrosse, soccer, swimming and ice hockey.

A jockstrap, also a jock (male), jill (female), strap, cup, groin guard, pelvic protector (female), supporter, or athletic supporter, is an undergarment for protecting the scrotum and penis or vulva during contact sports or other vigorous physical activity. This article deals chiefly with the genital protective sports gear designed for the male body, colloquially known as a "jock".