1977 Australian Open (December) – Men's singles
| Men's singles | |
|---|---|
| 1977 Australian Open (December) | |
| Champion | Vitas Gerulaitis |
| Runner-up | John Lloyd |
| Score | 6–3, 7–6(7–4), 5–7, 3–6, 6–2 |
| Draw | 64 |
| Seeds | 8 |
Vitas Gerulaitis defeated John Lloyd in the final, 6–3, 7–6(7–4), 5–7, 3–6, 6–2 to win the men's singles tennis title at the December 1977 Australian Open. It was his first and only major singles title. Gerulaitis was making his tournament debut.
Roscoe Tanner was the defending champion, but lost in the first round to Chris Lewis.
The second of the two Australian Opens held in 1977 started on 19 December and ended on 31 December. For the first Australian Open held in 1977, see: 1977 Australian Open (January).