"Can't Believe" is a duet by American recording artists Faith Evans and Carl Thomas. It was written and produced by Sean Combs and Mario Winans for Evans' third studio album Faithfully (2001) and is built around a sample of "Phone Tap" as performed by The Firm and penned by Nas, Anthony Cruz, Chris Taylor, Jermaine Baxter, and Dr. Dre.

The track appeared on Combs' Bad Boy compilation The Saga Continues... (2001) and was later released as the first single from Evans' album. Upon release, it reached number 54 on the US Billboard Hot 100 and number 14 on the US Billboard Hot R&B/Hip-Hop Songs chart. An accompanying music video was filmed by director Chris Robinson in 2001.