Sef Gonzales (born 16 September 1980) is a Filipino Australian who was convicted and sentenced in the Supreme Court of New South Wales to life imprisonment for the July 2001 murder of his father Teodoro "Teddy" Gonzales, aged 46 years, his mother Mary Loiva Gonzales, aged 43 years, and his sister Clodine Gonzales, aged 18 years, in Sydney, Australia.
As a result of notoriety surrounding the sale of the house where the crimes occurred, the NSW government made it illegal to not disclose information related to the history of a property.