1977 Australian Open (December)

The 1977 Australian Open (December) was a tennis tournament played on outdoor grass courts in Melbourne, Victoria, Australia. It was the 66th edition of the tournament and was held from 19 to 31 December 1977. Due to a scheduling change, two Australian Opens took place in 1977, with the first taking place in January. Vitas Gerulaitis and Evonne Goolagong Cawley won the singles titles.

Seniors

Men's singles

United States Vitas Gerulaitis defeated United Kingdom John Lloyd, 6–3, 7–6, 5–7, 3–6, 6–2

• It was Gerulaitis's 1st (and only) career Grand Slam title.

Women's singles

Australia Evonne Goolagong Cawley defeated Australia Helen Gourlay Cawley, 6–3, 6–0

• It was Goolagong Cawley's 6th career Grand Slam title.

Men's doubles

Australia Ray Ruffels / Australia Allan Stone defeated Australia John Alexander / Australia Phil Dent, 7–6, 7–6

Women's doubles

Australia Evonne Goolagong Cawley / Australia Helen Gourlay Cawley vs. United States Mona Schallau Guerrant / Australia Kerry Melville Reid, shared due to rained out final

Mixed doubles

Competition not held between 1970 and 1986.

Juniors

Boys' singles

Australia Ray Kelly

Girls' singles

Australia Amanda Tobin defeated Australia Leanne Harrison, 6–1, 6–2