Magnin is a surname. Notable people with the surname include:
Antoine Magnin (1848-1926), French botanistCharles Magnin (1793–1862), French writerCyril Magnin (1899–1988), American businessmanEdgar Magnin (1890–1984), American Reform rabbiEduardo Magnin (born 1969), Argentine footballerGérard Magnin (born 1951), French businessmanIsaac Magnin (1842-1907), American carver and gilder; co-founder of I. Magnin, an upscale women's clothing store in San Francisco, California.Ludovic Magnin (born 1979), Swiss footballerMae Magnin Brussell (1922–1988), American radio personality.Mary Ann Magnin (1850-1943), co-founder of I. Magnin, an upscale women's clothing store in San Francisco, California.