Glegg is a surname. Notable people with the surname include:
Historical Alex Glegg (born 1971), Canadian cricketer William Glegg, the founder of the Calday Grange Grammar School
Fictional characters Jane Glegg, in The Mill on the Floss by George Eliot J. Glegg, in Kabumpo in Oz by Ruth Plumly Thompson
See also Gregg (surname)