Garth John da Silva (born 28 December 1973 in Wellington, New Zealand) is a boxer from New Zealand, who competed at the 1996 Summer Olympics in Atlanta, Georgia.
There he won his first round in the Heavyweight (-91 kg) division against Cathel O'Grady of Ireland, before losing to Serguei Dychkov of Belarus.
In 1998 he won the bronze medal at the 1998 Commonwealth Games in Kuala Lumpur.