This is a list of winners of the Academy Award for Performance by an Actress in a Leading Role, presented annually by the Academy of Motion Picture Arts and Sciences (AMPAS) to an actress who has delivered an outstanding performance while working within the film industry. More popularly known as the Academy Award (or the Oscar) for Best Actress, this award was initially presented at the 1st Academy Awards ceremony for 1927–1928 and was most recently presented at the 93rd Academy Awards ceremony for 2020 and early 2021. Throughout the past 93 years, accounting for ties and repeat winners, AMPAS has presented a total of 94 Best Actress awards to 77 different actresses. This list is current as of the 93rd Academy Awards ceremony held on April 25, 2021.