Monica Reinach (born 29 September 1966) is a former professional tennis player from South Africa.

She is the elder sister of Elna Reinach, with whom she made the round of 16 of the women's doubles at the 1986 Wimbledon Championships.

She was a member of three World TeamTennis title winning teams, with Charlotte Heat in 1987 and 1988, then at the San Antonio Racquets in 1989.

A knee injury caused the end of her professional tennis career.

[1] She is married to South African former top 20 tennis player Christo van Rensburg.