2023 Australian Open – Men's singles

Novak Djokovic defeated Stefanos Tsitsipas in the final, 6–3, 7–6^(7–4), 7–6^(7–5) to win the men's singles tennis title at the 2023 Australian Open. It was his record-extending tenth Australian Open title and 22nd major men's singles title overall, equaling Rafael Nadal's all-time record. He was the second man to win ten titles at a single major, after Nadal at the French Open. Djokovic extended his match winning-streak at the Australian Open to an Open Era record 28 matches. It was his first appearance at the tournament since 2021, having been deported from the country the year before.

Nadal was the defending champion, but lost in the second round to Mackenzie McDonald. This marked the two-time champion, six-time finalist, Olympic gold medalist, and former world No. 1's final Australian Open appearance, as he retired from the sport the following year.

Carlos Alcaraz, Casper Ruud, Tsitsipas and Djokovic were in contention for the world No. 1 singles ranking at the beginning of the tournament. By winning the tournament, Djokovic reclaimed the top spot. Alcaraz, the incumbent world No. 1, withdrew from the tournament due to a right leg injury.

As in the previous major held a few months earlier, neither of the top two seeds advanced to the quarterfinals, with Nadal and Ruud both losing in the second round; this marked the first men's singles major since the 2002 Australian Open where the top two seeds lost prior to the third round. Tsitsipas was the youngest finalist since Djokovic in 2011. Tommy Paul was the first American man to reach the semifinals since Andy Roddick in 2009.

With his win over Thanasi Kokkinakis in the longest match of his career, Andy Murray won a match from two sets down for a record eleventh time.