John M. P. Marks (born 9 December 1952) is a former professional tennis player from Australia.

Marks won the ILTF Western Australian Championships on grass in 1978 at Perth defeating Mark Edmondson, Chris Kachel, and Bob Carmichael in a marathon five set final.

Marks is best remembered for finishing runner-up in singles at the 1978 Australian Open, defeating Arthur Ashe in the semifinals.

As a result of this slam final appearance, he achieved his career-high singles ranking of world No.

As a junior, Marks won the Australian Open boys' doubles in 1971, partnering Michael Phillips.