Garrett Kelleher is an Irish businessman. He is the founder and Executive Chairman of Shelbourne Development Group, a Dublin development and real estate firm. Kelleher is the owner of the Irish football club St Patrick's Athletic FC and a significant shareholder in Dolmen Securities, a Dublin based regulated stock brokerage, investment advisor and corporate finance house. Kelleher is a former Chicago resident, who currently lives in Ireland. Educated at Belvedere College, he first moved to the United States in 1978 to attend California University of Pennsylvania on a tennis scholarship. He moved back to Ireland to attend Trinity College Dublin from 1980 to 1983. Years later, he moved to Chicago and started a painting business that eventually had a crew of about 120 workers. He kept the business for about 10 years.
Kelleher was a commercial painting contractor in Chicago in the 1990s. He used the money he made in Chicago to participate in real estate construction in Ireland and closed his Chicago business as his Irish interests claimed more of his time. In 1995 Kelleher left Chicago, to return to Ireland where he founded Shelbourne Development.
In July 2006 Kelleher stepped in and bought a site at the intersection of the Chicago river and Lake Michigan after an earlier developer failed to close on the land. The 2.2-acre (8,900 m2) site would have housed the now cancelled The Chicago Spire designed by internationally renowned Spanish architect Santiago Calatrava. It would have been the tallest building in the US, and the world’s tallest exclusively residential building.
In June 2007 Kelleher appointed a new board of directors to St Patrick's Athletic FC, naming himself as Chairman. Having acquired the club earlier in 2007 he commented that “We have long-term ambitions for this football club which would establish it as a force in the European game."
Kelleher also sits on the Board of Regents at Ave Maria University in Florida. Opened in 2003 the University recognizes the importance of creating and maintaining an environment in which faith informs the life of the community. Kelleher also held the Chairmanship of Legatus in Ireland in 2006 which has aims of "To study live and spread the Faith in our business, professional and personal lives".
In 2013, Garrett Kelleher was named to the Advisory Board for the US-Ireland Alliance, a non-profit organization with a focus on educating Americans about Ireland and strengthening ties between the two countries through culture and business. 
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- Susan Diesenhouse 20 May (2007), Developer in new league
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- stpatsfc.com, 19 June (2007)