Johan Nikles (born 23 March 1997) is a Swiss tennis player.
Nikles has a career-high ATP singles ranking of World No. 256 achieved on 11 July 2022 and a career-high ATP doubles ranking of World No. 357 achieved on 3 October 2022.
On the junior tour, Nikles had a career-high ITF junior ranking of No. 26 achieved in January 2015.
Nikles made his ATP main draw debut at the 2016 Swiss Open Gstaad, receiving a singles main draw wildcard.
He qualified for the 2022 Geneva Open, defeating 3rd seed Peter Gojowczyk and 8th seed LukÃ¡à ¡ Rosol, and won his first ATP singles main draw match against compatriot wildcard Leandro Riedi, saving three match points. He lost to Tallon Griekspoor in the second round. As a result he moved 40 positions up into the top 300.