Admir Kalender (born 12 January 2001) is a Croatian tennis player. Kalender has a career-high ATP singles ranking of world No. 966 achieved on 28 August 2023 and a doubles ranking of No. 364 achieved on 30 March 2026.
Kalender made his ATP main draw debut at the 2021 Croatia Open Umag after receiving a wildcard into the doubles main draw.