Mark Wallner (born 20 July 1999) is a German tennis player who specializes in doubles.

He has a career high ATP doubles ranking of world No.

[1] Wallner played college tennis at Temple University[2] before transferring to Tennessee.

[3] He made his ATP main draw debut at the BMW Open in Munich, where he partnered with Jakob Schnaitter in the doubles tournament.

He also entered directly into the main draw in Hamburg with Jakob Schnaitter.