Daniel Masur (German pronunciation: [ˈdaːni̯eːl maˈzuːɐ̯, -ni̯ɛl -]; born 6 November 1994 in Bückeburg) is a German professional tennis player. He has a career-high ATP singles ranking of world No. 176, achieved in March 2022 and in doubles of No. 149 achieved in September 2022.