The 1978 New South Wales Open, also known by its sponsored name Marlboro New South Wales Open, was a combined men's and women's tennis tournament played on outdoor grass courts at the White City Stadium in Sydney, Australia. The men's event was part of the 1978 Colgate-Palmolive Grand Prix circuit while the women's event was art of the 1979 Colgate Series.[3] It was the 86th edition of the event and was held from 18 December through 24 December 1978. The singles titles were won by unseeded Tim Wilkison and second-seeded Dianne Fromholtz.[4][5]
