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
Vitas Gerulaitis defeated 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
Evonne Goolagong Cawley defeated Helen Gourlay Cawley, 6–3, 6–0
- It was Goolagong Cawley's 6th career Grand Slam title.
Men's doubles
Ray Ruffels / Allan Stone defeated John Alexander / Phil Dent, 7–6, 7–6
Women's doubles
Evonne Goolagong Cawley / Helen Gourlay Cawley vs. Mona Schallau Guerrant / Kerry Melville Reid, shared due to rained out final
Mixed doubles
- Competition not held between 1970 and 1986.
Juniors
Boys' singles
Ray Kelly
Girls' singles
Amanda Tobin defeated Leanne Harrison, 6–1, 6–2
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