Police say her death is not being treated as suspicious.
Born in Dublin in December 1966, Sinead O'Connor became one of the country's most famous daughters.
Her musical career began at the age of 15, and after a brief spell with a band in the 1980s, she was signed by Ensign Records.
Her first album The Lion and the Cobra was "a sensation" when it was released in 1987.
Her breakthrough on the international stage came with a recording of the Prince song, "Nothing Compares 2 U".
Throughout her career, O'Connor was open about her spiritual journey, activism, political views, as well as her mental health struggles.
Just before the turn of the century, she was ordained as a priest by the Latin Tridentine Church, while in 2018 she
converted to Islam.
She always performed and recorded under her birth name, but also went by the names Magda Davitt and Shuhada' Sadaqat.
O'Connor has had four children and has been married four times, and leaves a legacy of some of the most distinguishable songs of all time.
Flowers and candles are being placed outside Sinead O'Connor's former home in Bray.
Locals and neighbours have been reacting to her death.
The online book of condolence can be found here
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