Kathlyn is a feminine given name. Notable people with the name include:
Kathlyn Curtis (born 1963), Canadian judge Kathlyn Gilliam (1930–2011), American civil rights activist Kathlyn Kelly (1919–2006), American athlete Kathlyn Ragg (born 1962), Fijian cyclist Kathlyn Williams (1879–1960), American actress
See also The Adventures of Kathlyn, 1913 film Kathleen (given name) Kathryn (name)