Commelin may refer to:
Commelin (elm hybrid), a Dutch elm cultivar
People with the surname Caspar Commelin (1668–1731), Dutch botanist Hendrina Commelin (1843–1917), Dutch social worker and feminist Jan Commelin (1629–1692), Dutch botanist Isaac Commelin (1598–1676), Dutch historian
See also Commelina, commonly called dayflowers