Acis is a genus of perennial, herbaceous and bulbous plants in the amaryllis family (Amaryllidaceae, subfamily Amaryllidoideae[1]).

The genus consists of nine species distributed in Europe and Northern Africa.

[2][3] Acis was first differentiated from the genus Leucojum by Richard Anthony Salisbury in The Paradisus Londinensis in 1807.

[2][3] Acis was reinstated in 2004, after it was determined on morphological and molecular grounds that the broadly defined genus Leucojum was paraphyletic, with Acis and a more narrowly defined Leucojum being related as shown the following cladogram.

[7] The species Acis autumnalis has gained the Royal Horticultural Society's Award of Garden Merit.