Alvin and the Chipmunks (which includes Simon and Theodore)
Alvin Kersh, character from "The X Files"
Alvin, from movie "ParaNorman"
Alvin, crater on Mars Alvin, Canadian Standardbred racehorse
13677 Alvin, asteroid
DSV Alvin, deep-submergence vehicle
Alvin, fictional planet on ALF (TV series)
Alvin the Treacherous, villain in the "How to Train Your Dragon" book series and the "Riders of Berk" TV series.