Segar is both a surname and a given name. Notable people with the name include:
Surname: Charlie Segar, bluesman E. C. Segar (1894–1938), American cartoonist Joseph Segar (1804–1880), American lawyer William Segar (circa 1564–1633), portrait painter Rufus Segar (1932–2015), anarchist illustrator and graphic designer
Given name: Segar Bastard (1854–1921), English amateur football player and referee