Avenue Foch is an avenue in the 16th arrondissement of Paris, France, named after World War I Marshal Ferdinand Foch in 1929. Previously it was known as the Avenue du Bois de Boulogne. It is one of the most prestigious streets in Paris, as well as one of the most expensive addresses in the world, home to many grand city palaces, including ones belonging to the Onassis and Rothschild families. The Rothschilds once owned numbers 19–21.

Jean-Charles Adolphe Alphand was a French engineer of the Corps of Bridges and Roads. As a close associate of Baron Haussmann and later as Director of Public Works at Paris City Hall from 1871, he was instrumental in the large-scale renovation of Paris in the second half of the 19th century. In 1889, Alphand was elevated to the rank of Grand Cross of the Legion of Honour. In 1891, shortly before his death, he succeeded Haussmann as a member of the Académie des Beaux-Arts.