Kristjan Tamm (born 16 June 1998) is an Estonian tennis player. Tamm has a career high ATP singles ranking of 625 achieved on 21 December 2020. He also has a career high ATP doubles ranking of 694, achieved on 31 May 2021. Tamm has won 2 ITF titles. Tamm has represented Estonia at Davis Cup. In Davis Cup he has a win–loss record of 2–2.