Aleksander Koniecpolski (1555–1609) was a voivode (palatine) of Sieradz a staunch supporter of king Sigismund III Vasa of the House of Vasa.He was the son of Stanisław Przedbór Koniecpolski and Elżbieta Ligzianka (relative of hetman Jan Tarnowski). His wife was Anna Sroczycka daughter of Stanisław Sroczycki voivode of Kamieniec.