Derryth Lynne Thomas (born 29 September 1939) is a Welsh former cricketer who played as a right-handed batter and right-arm off break bowler. She appeared in 10 Test matches and 12 One Day Internationals for England between 1966 and 1979. She also played 12 matches for, and was captain of, International XI at the 1982 World Cup. She played domestic cricket for West of England. She also played hockey at international level for Wales. She was a full-time P.E. teacher at Neath Girls' Grammar School.