David Poljak (born 17 May 1996) is a Czech tennis player.
Poljak has a career high ATP singles ranking of No. 370 achieved on 21 March 2022 and a career high ATP doubles ranking of No. 172 achieved on 23 February 2026.
Poljak scored couple of big wins in singles as he beat several former and future Top 50 players like Denis Istomin, Fabian Marozsan, Thomaz Bellucci, Andrey Golubev, Roman Safiullin, Flavio Cobolli, Illya Marchenko or grand slam doubles champions Andrea Vavassori and Sem Verbeek.
Poljak has won one ATP Challenger doubles title at the 2026 Tenerife Challenger II.