Celsia can refer to:
Plants Celsia Boehm., nom. illeg., considered a synonym of Colchicum Celsia Heist. ex Fabr., nom. illeg., considered a synonym of Ornithogalum Verbascum, various species, particularly V. bugulifolium, a garden plant formerly known as Celsia bugulifolia
Insects Staurophora celsia, a moth
Other An electricity generation and distribution company owned by Grupo Argos
See also Celsian, a feldspar mineral