Sinéad Marie Bernadette O'Connor (/ʃɪˈneɪd oʊˈkɒnər/; born 8 December 1966) is an Irish singer-songwriter who rose to fame in the late 1980s with her debut album The Lion and the Cobra. O'Connor achieved worldwide success in 1990 with a new arrangement of Prince's song "Nothing Compares 2 U".

Since then, while maintaining her singing career, she has occasionally encountered controversy, partly due to her statements and gestures—such as her ordination as a priest despite being a woman with a Roman Catholic background—and her strongly expressed views on organised religion, women's rights, war, and child abuse.