The 20-year-old striker adds further strength to Steve Bruce's front-line, following the captures of Yannick Bolasie and Anwar El-Ghazi earlier in the transfer window.
He joins on a season-long loan, and will provide competition for the likes of Jonathan Kodjia, Scott Hogan, Keinan Davis and Rushian Hepburn-Murphy.
Abraham was prolific during his previous spell in the Championship with Bristol City scoring 23 times in 41 appearances.
He spent last season on-loan at Swansea, scoring eight goals.
“I’m excited for this new chapter." he said.
“Aston Villa are a big club that belongs in the Premier League and I’m here to help them achieve that.
“At this stage of my career, I need games and this is a great place for me to come and showcase my talent. I can’t wait to get started."