Abbeyleix House, sometimes called Abbeyleix Castle, is an Irish country house that was the residence of the Viscounts de Vesci in County Laois, Ireland. It was designed by architect James Wyatt and built by Sir William Chambers in 1773. The de Vesci family lived at Abbeyleix House until it was sold in the mid-1990s. Abbeyleix is the oldest planned estate town in Ireland.

James Wyatt was an English architect, a rival of Robert Adam in the neoclassical and neo-Gothic styles. He was elected to the Royal Academy of Arts in 1785 and was its president from 1805 to 1806.