Deen Joseph Castronovo is an American drummer and singer best known for being a member of classic rock band Journey and hard rock acts Bad English and Hardline. He currently plays drums and shares lead vocals for the bands Journey, Generation Radio, and Revolution Saints. He has been a touring and studio player for Ozzy Osbourne, Steve Vai, Paul Rodgers, and Black Sabbath bassist Geezer Butler's GZR.

Journey is an American rock band formed in San Francisco in 1973 by former members of Santana, the Steve Miller Band, and Frumious Bandersnatch. The band as of 2024 consists of guitarist/vocalist Neal Schon, keyboardist/guitarist/vocalist Jonathan Cain, keyboardist/vocalist Jason Derlatka, drummer/vocalist Deen Castronovo, bassist Todd Jensen, and lead vocalist Arnel Pineda.