Margaret Hellyer (born 29 July 1937) is an Australian former tennis player.

[1] Active in the 1950s and 1960s, Hellyer is a native of Sydney and had some of her best results on the grass courts of Wimbledon.

She won the All England Plate in 1957 and was a mixed doubles semi-finalist that year with Roy Emerson.

Her best singles run was a fourth round appearance in 1960 and she twice reached the women's doubles quarter-finals.

Hellyer had a relationship with Brazilian tennis player Carlos Fernandes and the pair were engaged.