Greg Halder (born December 5, 1955) is a Canadian former professional tennis player.

Born and raised in Toronto, Halder is the son of ice hockey player Wally Halder, who was a member of the gold medal-winning team at the 1948 Winter Olympics.

[2] At the 1977 Volvo International in North Conway he had an upset win over world number five Raul Ramirez.

[3] In 1978 he featured in the singles main draws of the Wimbledon Championships and US Open.

He represented Canada in two Davis Cup ties during his career.