Sean Taro Ono Lennon (aka Sean Ono Lennon, born October 9, 1975) is the son of musicians and peace activists John Lennon and Yoko Ono (making Kyoko Chan Cox and Julian Lennon his half-siblings). His father is of Welsh and Irish ancestry and his mother is Japanese. He was born in New York City on his father's 35th birthday. After Sean's birth, John became a house husband, doting on his young son until his murder in 1980.

His first appearance on record was on Ono's Season of Glass in 1981, reciting a story that his father used to tell him. At the age of 9 he performed the song "It's Alright" on the 1984 Yoko Ono tribute album Every Man Has A Woman. Later in life his initial efforts as a serious musician were collaborations. He appeared on Lenny Kravitz's 1991 album Mama Said, formed backing-band IMA for his mother's 1995 album Rising, and has collaborated with the New York-based Japanese duo Cibo Matto, as well as the nu-metal band Soulfly.

Through his association with Cibo Matto, he was approached by the Beastie Boys' Adam Yauch, who expressed an interest in Sean's music. His debut solo album, Into the Sun, was released in 1998 on the Beastie Boys's record label, Grand Royal Records. It garnered positive reviews. Regarding Grand Royal, Sean has said, "I think I found the only label on the planet who doesn't care who my parents are and what my name is. It's a good feeling to know that I wouldn't have gotten the offer if they wouldn't have liked my songs. That's pretty rare in the music business!"

In 1999, Sean's EP Half Horse, Half Musician was released, a compilation of outtakes and remixes from Into The Sun. The Japanese version contains the bonus "Into the Sun (Moog remix)". He also made a guest appearance on the underground hip-hop collaborations, Deltron 3030, working with Del Tha Funkee Homosapien and Dan Nakamura, singing the bridge to the song "Memory Loss."

He has also appeared on records by Handsome Boy Modeling School, Money Mark, and Ben Lee, and with musicians such as Josh Haden. Past girlfriends include Yuka Honda of Cibo Matto, Bijou Phillips, and Elizabeth Jagger (daughter of Mick Jagger).

After Grand Royal Records' demise in 2001, Sean signed with Capitol Records. Yet no material surfaced until early February 2006 on his website. A song called "Dead Meat" is to be his first single (with a video recorded and scheduled to be released) from his new album Friendly Fire. The new album will be released in September 2006 on Capitol Records.