Fitzwilliam Square (Irish: Cearnóg Mhic Liam) is a Georgian garden square in the south of central Dublin, Ireland. It was the last of the five Georgian squares in Dublin to be built, and is the smallest.
The square was developed by Richard FitzWilliam, 7th Viscount FitzWilliam, hence the name. It was designed from 1789 and laid out in 1792. The center of the square was enclosed in 1813 through an Act of the Parliament of Ireland. To the north is the much larger Merrion Square, with which Richard FitzWilliam was also involved. The square was a popular place for the Irish Social Season of aristocrats entertaining in Dublin between January and Saint Patrick's Day each year.
In recent years, the Georgian district has become increasingly popular with residents who are willing to pay handsomely to live like the Georgians. Fitzwilliam Square has become home to many such residents. Sir Anthony O'Reilly resided at No.2 until recently  and Danielle Ryan, Ryanair heiress, resides with her family at No. 24. 
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