Robert Michael Sheehan (Irish: Roibeárd Mícheál Ó Siodhacháin) is an Irish actor. He is best known for television roles such as Nathan Young in Misfits and Darren in Love/Hate, as well as the 2009 film Cherrybomb alongside Rupert Grint. He also co-starred in the film Killing Bono as Ivan McCormick. In late 2011 he starred in John Crowley's production of J. M. Synge's comic play The Playboy of the Western World at the Old Vic Theatre in London. Most recently he has appeared in Geostorm with Gerard Butler. Sheehan has three IFTA nominations and one BAFTA nomination. He also shared a BAFTA award with the cast of Misfits.
In 2013 he portrayed Simon Lewis in the film adaptation of The Mortal Instruments book City of Bones