"We've seen the passion and support of the Alabama fans firsthand, and when that's combined with the storied history and tradition of the program, this is a very special place to coach."
Now, Kiffin's tasked with finding a replacement for quarterback AJ McCarron, the Heisman Trophy runner up.
His hiring creates a high-profile pairing with Saban, who along with defensive coordinator Kirby Smart has routinely fielded one of the nation's best defenses while also putting up solid numbers with a pro-style offense.
Kiffin was part of two national championships as a USC assistant under Carroll. He ran the offense from 2005-06 and was passing game coordinator the previous year, when quarterback Matt Leinart won the Heisman.
The Trojans averaged 49.1 points and 579.8 total yards per game when Kiffin was offensive coordinator.
No terms of the deal with Alabama were released, pending formal approval by the university's board of trustees.