"I'm a Believer" is a song written by Neil Diamond and recorded by American 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. While originally published by Screen Gems-Columbia Music (BMI), it is now published by Stonebridge Music/EMI Foray Music (SESAC), with administration passed to Sony Music Publishing and Universal Music Publishing Group.

Neil Leslie Diamond is an American singer-songwriter. He has sold more than 130 million records worldwide, making him one of the best-selling musicians of all time. He has had ten No. 1 singles on the U.S. Billboard Hot 100 and Adult Contemporary charts: "Cracklin' Rosie", "Song Sung Blue", "Longfellow Serenade", "I've Been This Way Before", "If You Know What I Mean", "Desirée", "You Don't Bring Me Flowers", "America", "Yesterday's Songs", and "Heartlight". Thirty-eight songs by Diamond have reached the top 10 on the Billboard Adult Contemporary charts, including "Sweet Caroline". He has also acted in films, making his screen debut in the 1980 musical drama film The Jazz Singer.