1977 Australian Open (January)

The 1977 Australian Open (January) was a tennis tournament played on outdoor grass courts at the Kooyong Lawn Tennis Club in Melbourne, Australia. The tournament was held from 3 to 9 January 1977. Due to a scheduling change, two Australian Opens took place in 1977 with the second taking place in December.

Men's singles
🇺🇸 Roscoe Tanner defeated 🇦🇷 Guillermo Vilas, 6–3, 6–3, 6–3
 * It was Tanner's 1st (and only) career Grand Slam title.

Women's singles
🇦🇺 Kerry Melville Reid defeated 🇦🇺 Dianne Fromholtz, 7–5, 6–2
 * It was Melville's 1st (and only) career Grand Slam title.

Men's doubles
🇺🇸 Arthur Ashe / 🇦🇺 Tony Roche defeated 🇺🇸 Charlie Pasarell / 🇺🇸 Erik van Dillen, 6–4, 6–4

Women's doubles
🇦🇺 Dianne Fromholtz / 🇦🇺 Helen Gourlay defeated 🇦🇺 Kerry Melville Reid / 🇺🇸 Betsy Nagelsen, 5–7, 6–1, 7–5

Mixed doubles

 * Competition not held between 1970 and 1986.

Boys' singles
🇦🇺 Brad Drewett defeated 🇺🇸 Tim Wilkison, 6–4, 7–6

Girls' singles
🇦🇺 Pamela Baily defeated 🇦🇺 Amanda Tobin, 6–2, 6–3