The 1966 Australian Championships was a tennis tournament that took place on outdoor Grass courts at the White City Tennis Club, Sydney, Australia from 21 to 31 January. It was the 54th edition of the Australian Championships (now known as the Australian Open), the 15th held in Sydney, and the first Grand Slam tournament of the year. The singles titles were won by Australians Roy Emerson and Margaret Smith.

Champions

Men's singles

🇦🇺 Roy Emerson defeated 🇺🇸 Arthur Ashe 6–4, 6–8, 6–2, 6–3

Women's singles

🇦🇺 Margaret Smith defeated 🇺🇸 Nancy Richey walkover

Men's doubles

🇦🇺 Roy Emerson / 🇦🇺 Fred Stolle defeated 🇦🇺 John Newcombe / 🇦🇺 Tony Roche, 7–9, 6–3, 6–8, 14–12, 12–10

Women's doubles

🇺🇸 Carole Graebner / 🇺🇸 Nancy Richey defeated 🇦🇺 Margaret Smith / 🇦🇺 Lesley Turner, 6–4, 7–5

Mixed doubles

🇦🇺 Judy Tegart / 🇦🇺 Tony Roche defeated 🇦🇺 Robyn Ebbern / 🇦🇺 Bill Bowrey, 6–1, 6–3