| Cecelia Wolstenholme | |
| Fullname: | Cecelia Wolstenholme |
| Nicknames: | "Cee Cee" |
| Strokes: | Breaststroke |
| Birth Date: | 18 May 1915 |
| Birth Place: | Withington, England |
Cecelia Wolstenholme (18 May 1915 - 25 October 1968), later known by her married name Cecelia Thornton, was an English competitive swimmer who represented Great Britain in the Olympic Games and European championships, and England in the British Empire Games. She won the 200 yd breaststroke at the 1930 British Empire Games and the 200 m breaststroke at the 1931 European Championships, beating Jenny Kastein. She competed in the latter event at the 1932 Summer Olympics, but failed to reach the final. Her younger sister Beatrice was also an international swimmer.