John Anthony Mallett (born Lincoln, 28 May 1970) is a former English rugby union footballer. He played as a prop.
Mallett was educated at Millfield and played for Bath Rugby, until 2002, where his team won 3 titles in the Guinness Premiership, in 1992/93, 1993/94 and 1995/96, and 3 titles in the Anglo-Welsh Cup, in 1993/94, 1994/95 and 1995/96. Mallet's team also won the Heineken Cup, in 1997/98.
Mallett was selected for England, to take part in the 1995 Rugby World Cup finals; he played a single match against Manu Samoa. He is now head of rugby at Millfied School, Somerset.