Michelle Smith de Bruin (born 16 December 1969 in Rathcoole, County Dublin) is a retired Irish swimmer who achieved notable success in the 1996 Summer Olympics in Atlanta, becoming Ireland's most successful Olympian to date, and whose career ended with a ban from the sporting authorities for tampering with a urine sample. She was a triple gold medallist at the Atlanta Games, for the 400 m individual medley, 400 m freestyle and 200 m individual medley, and also won the bronze medal for the 200 m butterfly event: these events were marked by allegations of doping which were, however, never proven. Michelle Smith, now more commonly referred to by her married name, Michelle de Bruin, is currently a practising barrister.