Cowdin is a surname. Notable people with the surname include:
Elliot Cowdin (1819–1880), American businessman and politician Elliott Christopher Cowdin II (1886–1933), American WWI veteran John Cheever Cowdin (1889–1960), American financier and polo player John Elliot Cowdin (1858–1941), American polo player Robert Cowdin (1805–1874), American businessman, Civil War veteran, and politician