The 1977 Australian Open (December) was a tennis tournament played on outdoor grass courts in Melbourne, Victoria, Australia.

[3] It was the 66th edition of the tournament and was held from 19 to 31 December 1977.

[3] 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.

Vitas Gerulaitis defeated John Lloyd, 6–3, 7–6, 5–7, 3–6, 6–2 Evonne Goolagong Cawley defeated Helen Gourlay Cawley, 6–3, 6–0 Ray Ruffels / Allan Stone defeated John Alexander / Phil Dent, 7–6, 7–6 Evonne Goolagong Cawley / Helen Gourlay Cawley vs. Mona Schallau Guerrant / Kerry Melville Reid, shared due to rained out final [4] Ray Kelly[5] Amanda Tobin defeated Leanne Harrison, 6–1, 6–2[6][7]