Gabriel-Hippolyte Alexandre Destailleur (1822–1893) was a renowned Neo-Renaissance French architect noted for his designs and restoration work for great châteaux in France and in England.
Gabriel-Hippolyte Destailleur is one of the best-known foreign architects to have worked in 19th century England, where he designed Waddesdon Manor in Buckinghamshire for Baron Ferdinand de Rothschild and the Imperial Mausoleum at Saint Michael's Abbey in Farnborough, Hampshire.
He oversaw the designwork and restoration of the Château de Courances and Vaux-le-Vicomte beginning in 1875. He designed the Hôtel de Béhague in Paris (1866-1867), and for Baron Albert von Rothschild, he designed the Palais Rothschild at Prinz-Eugen-Straße 20-22, in the Wieden district of Vienna (1876–82) and the Château de Franconville in Oise for the Duc de Massa (1880-1885).
His son Walter-André Destailleur was also an architect. He was known as a famous book collector.