Alceste (Alcides; HWV 45, HG: 46b, HHA: I/30) is a masque or semi-opera by George Frideric Handel.

It was written as incidental music to a lost play by Tobias Smollett, which was rehearsed at Covent Garden Theatre but never performed. There was an overture and songs for Acts 1 and 4, 19 movements in total. It was composed from 27 December 1749 to 8 January 1750. Handel later used the music in The Choice of Hercules, HWV 69, and revivals of Alexander Balus, HWV 65, and Hercules, HWV 60.