Eltham Palace is a large house at Eltham in southeast London, England, within the Royal Borough of Greenwich. The house consists of the medieval great hall of a former royal residence, to which an Art Deco extension was added in the 1930s. The hammerbeam roof of the great hall is the third-largest of its type in England, and the Art Deco interior of the house has been described as a "masterpiece of modern design". The house is owned by the Crown Estate and managed by English Heritage, which took over responsibility for the great hall in 1984 and the rest of the site in 1995
 
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From the 14th to the 16th century, Eltham Palace served as one of the most frequented and largest royal residences in England, second in importance only to the Palace of Westminster.
In the winter of 1400–1401, King Henry IV hosted Manuel II Palaiologos, the only Byzantine emperor to ever visit England, with a grand joust held in his honor.