What was the most successful single song ever released by The Jackson 5?

The most successful single song ever released by The Jacksons 5 is "I'll Be There". It is a song that was included on the group's third studio album "Third Album" (1970). It was written by Berry Gordy, Hal Davis, Bob West, and Willie Hutch.

As the first single from their "Third Album", the song was recorded and then released by Motown Records. "I'll Be There" was The Jackson 5's fourth No. 1 hit in a row (after "I Want You Back" in 1969, "ABC" in February 1970, and "The Love You Save" in May 1970), making them the first group to have their first four singles reach No. 1 and the first black male group with four consecutive No. 1 pop hits. "I'll Be There" is also notable as the most successful single released by Motown during its "Detroit era" (1959–72).

Michael Jackson wrote in his 1988 autobiography "Moonwalk" that "I'll Be There" was the song that solidified The Jackson 5's careers and showed audiences the group's full musical potential. It sold 4.2 million copies in the US, and 6.1 million copies worldwide. The song held the No. 1 position on the Billboard Pop Singles Chart for 5 weeks from mid October to mid November. Additionally, it was a No. 1 hit on the Billboard Black Singles Chart for 6 weeks, and a No. 4 hit in the UK. "I'll Be There" was The Jackson 5's final No. 1 Hot 100 hit as a group. For the rest of their career as a major musical act, the group would climb no higher than No. 2.

In 2011, "I'll Be There" was inducted into the Grammy Hall of Fame.