A live performance by McCartney's later band Wings from its 1976 tour of America was released as a single. It became a top-ten hit in the United States and reached number 26 in the United Kingdom. The original studio version from McCartney has never been released as a single.
McCartney wrote the song in 1969, just before the Beatles' break-up. He credited his wife Linda with helping him get through the difficult time. Although most of his debut solo album was recorded at his farm in Scotland, McCartney recorded "Maybe I'm Amazed" entirely in EMI's Number Two studio in Abbey Road in London, where he was mixing "Every Night". He played all the instruments: guitars, bass, piano, organ and drums. Although McCartney declined to release the song as a single in 1970, it nonetheless received a great deal of radio airplay worldwide, making it one of his most recognisable solo successes. A promotional film was made, comprising still photographs of McCartney, his wife Linda and stepdaughter Heather, which first aired in the UK on 19 April 1970 on ITV in its own slot, and as a part of an episode CBS Television's The Ed Sullivan Show.
The original studio version of the song finished with a fade instead of a full ending, but McCartney later composed an ending that can be heard on the live versions of the song. McCartney first performed this live with Wings, in Châteauvallon, France, on 9 July 1972. During his guest appearance in The Simpsons episode "Lisa the Vegetarian", McCartney says to Lisa and Apu "If you play Maybe I'm Amazed backwards, you'll find a recipe for a ripping lentil soup", which can be heard in the background when the song is played during the closing credits to the episode.
Regarded as one of McCartney's finest love songs, it achieved the number 347 position in the "500 Greatest Songs of All Time" list compiled by Rolling Stone magazine in November 2004, and is the only solo McCartney song to make the list. In a late 2009 Q&A with journalists held in London to promote his live album Good Evening New York City, McCartney said "Maybe I'm Amazed" was "the song he would like to be remembered for in the future".
On 27 May 2011, the official Paul McCartney YouTube channel held a "Maybe I'm Amazed Cover Competition" where users would submit video responses of themselves covering the song, the winner being the user whose video gained the most 'likes'. On 28 June 2011, YouTube user "Troubleclef" was named winner of the contest.