Guillaumin is a French surname. Notable people with the surname include:

• André Guillaumin (1885–1974), French botanist

• Armand Guillaumin (1842–1927), French impressionist painter and lithographer

• Claude Guillaumin (1842–1927), French painter and caricaturist

• Colette Guillaumin (1934–2017), French sociologist

• Gilbert-Urbain Guillaumin (1801–1864), French publisher