Acrasia is a lack of self-control, or irregular or unruly behaviour. It may also refer to:
Acrasia (horse), a racing horse, 1904 Melbourne Cup winner Acrasia (moth), a geometer moth genus Acrasia (protists), a proposed phylum of protists Acrasia, a character in Edmund Spenser's epic poem The Faerie Queene Akrasia, a term in philosophy meaning a lack of mental strength, or the state of acting against one's better judgment
See also Acrasin