Sinéad Marie Bernadette O'Connor (born December 8, 1966) is a Grammy Award winning Irish singer and songwriter.

O'Connor's first two albums (1987's The Lion and the Cobra and 1990's I Do Not Want What I Haven't Got) gained considerable attention and mostly positive reviews. She was praised for her voice and her original songs. She was also noted for her appearance: her shaved head, often angry expression, and sometimes shapeless or unusual clothing. The album I Do Not Want What I Haven't Got featrued Marco Pirroni and Kevin_Mooney both of Adam and the Ants fame and contained her international breakthrough hit "Nothing Compares 2 U", a song written by Prince and originally recorded and released by a side project of his, The Family. Her 2002 album, Sean-Nós Nua, marked a departure in that O'Connor interpreted or, in her own words, "sexed up" traditional Irish folk songs, including several in the Irish language.

O'Connor released two songs from her album Theology to download for free from her official website: "If You Had a Vineyard" and "Jeremiah (Something Beautiful)". The album, a collection of covered and original Rastafari spiritual songs, was released in June 2007. The first single from the album, the Rice/Lloyd Webber classic "I Don't Know How to Love Him", was released on April 30, 2007. To promote the album, O'Connor toured extensively Europe and North America.