Natalie Alwyne Steward (born 30 April 1943) is a former British Olympic swimmer.

Although Steward was born in Pretoria, South Africa, her family would later move to Bulawayo, Southern Rhodesia, for whom she would compete for at the 1958 British Empire and Commonwealth Games.

[1] Steward was just 13 years old when she competed in her first Rhodesian Championships in 1956, where she won three events, he international debut happened later that year in the Durban Currie Cup, the following year she would break 23 Rhodesian senior and junior records, after the 1958 British Empire and Commonwealth Games, her family moved to Hornchurch, Essex, which allowed to compete for the Great Britain Team.

She was also a member of both the 4×100 m freestyle and 4×100 m medley relay teams, finishing fifth in both events.

[4][5][6] In 1962 Steward aged just 18 years old retired and returned to Rhodesia to become a professional swimming coach.