Aleksandra Kurzak (Polish pronunciation: [alɛkˈsandra ˈkuʐak]; born 7 August 1977) is a Polish operatic soprano who has an international career primarily in Europe and the United States. In her earlier career she was a specialist in lyric and coloratura soprano roles in German and Italian repertoire, and transitioned into heavier roles in 19th-century Romantic and verismo operas.

Trained in Wrocław and Hamburg, she started her career in Hamburg State Opera's ensemble. She received international attention after her debuts at the Metropolitan Opera in New York and the Royal Opera, London in the 2004/05 season. Apart from the Met and Covent Garden, she has performed leading roles with many opera companies, including the Vienna State Opera, Bavarian State Opera, and Paris Opera. Her notable roles include Susanna in The Marriage of Figaro, Adina in L'elisir d'amore, Gilda in Rigoletto, Violetta in La traviata, and Nedda in Pagliacci. Since her marriage to Roberto Alagna in 2015, the couple has made frequent joint appearances on both concert and opera stages.

Kurzak had been exclusive with Decca Records artist from January 2011 until moving to Sony Classical Records in May 2018.