Lock Up the Wolves is the fifth studio album by American heavy metal band Dio, released on May 15, 1990. It displayed a complete change of musician line-up over the previous album, Dream Evil, including 18-year-old guitarist Rowan Robertson and Simon Wright on drums who had played with AC/DC from 1983 to 1989 as well as bassist Teddy Cook who was in the band Hotshot that morphed into Danger Danger. Rod Simpkins from the Hollywood bands Riken and Jungle Alley also filled in on bass for several tour dates in 1990. Former Dio Bass player Jimmy Bain was not able to fill tour dates for Teddy Cook due to health concerns.

Dio was an American heavy metal band formed in 1982 and led by vocalist Ronnie James Dio. Dio left Black Sabbath with intentions to form a new band with fellow former Black Sabbath drummer Vinny Appice. The name Dio was chosen because it made sense from a commercial standpoint, as the name was already well known at that time.