The 24-year-old scored 26 goals as the Bees reached the Championship play-off final last season.
Manager Dean Smith said: “Ollie has developed into one of the most sought-after strikers in the country and we are looking forward to seeing him show his great qualities in an Aston Villa shirt.”
Ollie Watkins: Announced. ✅
Say hello to our new striker! 🙌#WatkinsAnnounced— Aston Villa (@AVFCOfficial) September 9, 2020
