Shuhada' Sadaqat (born Sinéad Marie Bernadette O'Connor shin-AYD; 8 December 1966 – 26 July 2023) was an Irish singer, songwriter, and activist. Her debut studio album, The Lion and the Cobra, was released in 1987 and achieved international chart success. Her 1990 album, I Do Not Want What I Haven't Got, was her biggest commercial success, selling over seven million copies worldwide. Its lead single, "Nothing Compares 2 U", was honoured as the top world single of the year at the Billboard Music Awards.

O'Connor achieved chart success with Am I Not Your Girl? (1992) and Universal Mother (1994), both certified gold in the UK, as well as Faith and Courage (2000), certified gold in Australia. Throw Down Your Arms (2005) achieved gold status in Ireland. Her career encompassed songs for films, collaborations with numerous artists, and appearances at charity fundraising concerts. O'Connor's memoir, Rememberings, was released in 2021 and became a bestseller.

O'Connor drew attention to issues such as child abuse, human rights, racism, and women's rights. During a Saturday Night Live performance in 1992, she tore up a photograph of Pope John Paul II to protest against abuse in the Catholic Church, sparking controversy. Throughout her musical career, she openly discussed her spiritual journey, activism, socio-political viewpoints, and her experiences with trauma and struggles with mental health. After converting to Islam in 2018, she adopted the name Shuhada' Sadaqat while continuing to perform and record under her birth name. In 2024, O’Connor was nominated for induction into the Rock and Roll Hall of Fame.