Regner Olaf "Jack" Cummings (8 May 1901 – 22 January 1972) was an Australian tennis player.

Cummings finished runner-up to Jean Borotra at the Australian Championships, the future Australian Open, in 1928.

Cummings won the Queensland Championships in 1926 and 1930.

Cummings turned professional in late 1935.

This biographical article relating to Australian tennis is a stub.