Alexander Erler (German pronunciation: [ʔalɛˈksandɐ ˈʔɛɐ̯lɐ]; born 27 October 1997) is an Austrian tennis player. He has a career high ATP singles ranking of world No. 322, achieved on 4 October 2021. He has a career high doubles ranking of world No. 47, achieved on 7 November 2022. He has won two doubles titles on the ATP tour with compatriot Lucas Miedler both at the home tournaments in Kitzbühel and in Vienna.