Daniel Siniakov (born 15 January 2003) is a Czech tennis player. Siniakov has a career high ATP singles ranking of No. 614 achieved on 30 March 2026 and a career high ATP doubles ranking of No. 323 achieved on 30 March 2026.
Siniakov has won one ATP Challenger doubles title at the 2025 INTARO Open II.
Daniel is younger brother of grandslam champion and world No. 1 player Kateà Âina Siniaková.