The Chelsea Headhunters are a notorious English football hooligan firm linked to the London football club Chelsea.

Beginning in at least the 1960s, the United Kingdom gained a reputation worldwide for football hooliganism; the phenomenon was often dubbed the British or English Disease. However, since the 1980s and well into the 1990s the UK government has led a widescale crackdown on football related violence. While football hooliganism has been a growing concern in some continental European countries in recent years, British football fans now tend to have a better reputation abroad. Although reports of British football hooliganism still surface, the instances now tend to occur at pre-arranged locations rather than at the matches themselves.