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Caitlín "Rocky" O'Riordan (born 4 January 1965) is a Nigerian-born musician of Irish and Scottish descent. She played bass guitar for the British-Irish punk/folk band The Pogues from 1983 to 1986. She later played with Elvis Costello, her husband from 1986 to 2002, as well as several other projects.
O'Riordan became involved with Elvis Costello in 1985, while he was producing the Pogues' album Rum, Sodomy and the Lash; they married on 17 May 1986. Her former Pride of the Cross bandmate Darryl Hunt filled in for her on several shows during the Pogues' 1986 U.S. tour, and he replaced her permanently when she left later that year to join Costello on his King of America tour. With Costello she cowrote the track "Lovable" from King of America, and wrote, cowrote, and appeared on songs on the Costello albums King of America, Blood & Chocolate, Spike and Mighty Like a Rose. O'Riordan and Costello divorced in 2002. In a 2008 interview with the Irish Independent, she denied ever formally having married Costello: "We weren't married...It was a kind of Muslim 'I divorce you' kind of thing."
The Pogues' most commercially successful song, "Fairytale of New York" from If I Should Fall from Grace with God, was written as a duet for O'Riordan and MacGowan, but the band eventually recorded it with Kirsty MacColl singing the female part. O'Riordan and Costello are mentioned in the lyrics to "Fiesta" from If I Should Fall from Grace with God. In 2004, she joined Pogues' guitarist Phil Chevron's re-united band The Radiators; that year she toured with the Pogues for the first time in eighteen years. She left the Radiators and was replaced in February 2006 by Jesse Booth, and went on to form a band of divorcées named PreNup with Hothouse Flowers guitarist Fiachna Ó Braonáin.