2017 Australian Open – Women's singles

Serena Williams defeated her sister Venus Williams in the final, 6–4, 6–4 to win the women's singles tennis title at the 2017 Australian Open. It was her seventh Australian Open singles title and her 23rd and last major singles title overall, surpassing Steffi Graf as the Open Era leader in women's singles major titles. Serena did not lose a set during the tournament. This marked the first time the Williams sisters contested a major final since the 2009 Wimbledon Championships, the first time they contested the Australian Open final since 2003, and their ninth meeting in a major final overall. With the win, Serena also regained the world No. 1 singles ranking, and remains the oldest woman in the Open Era to win a singles major, aged 35 years and four months. Serena was roughly 8-weeks pregnant with her first daughter, Alexis Olympia Ohanian Jr., by the end of the tournament. It was Venus' first major final since the 2009 Wimbledon Championships.

Angelique Kerber was the defending champion, but lost in the fourth round to CoCo Vandeweghe.

Mirjana Lučić-Baroni reached her second major semifinal over 17 years after her first, at the 1999 Wimbledon Championships.