"I'm a Believer" is a song written by Neil Diamond and recorded by the American pop rock band the Monkees in 1966 with the lead vocals by Micky Dolenz. The single, produced by Jeff Barry, hit the number-one spot on the U.S. Billboard Hot 100 chart for the week ending December 31, 1966, and remained there for seven weeks becoming the last number-one hit of 1966 and the biggest-selling single for all of 1967. Billboard ranked the record as the number-five song for 1967.