The Washington Square Arch, officially the Washington Arch, is a marble memorial arch in Washington Square Park, in the Greenwich Village neighborhood of Lower Manhattan, New York City. Designed by architect Stanford White in 1891, it commemorates the centennial of George Washington's 1789 inauguration as President of the United States, and forms the southern terminus of Fifth Avenue.

Memorial gates and arches are architectural monuments in the form of gates and arches or other entrances, constructed as a memorial, often dedicated to a particular war though some are dedicated to individuals. The function, and very often the architectural form, is similar to that of a Roman triumphal arch, with the emphasis on remembrance and commemoration of war casualties, on marking a civil event, or on providing a monumental entrance to a city, as opposed to celebrating a military success or general, though some memorial arches perform both functions. They can vary in size, but are commonly monumental stone structures combining features of both an archway and a gate, often forming an entrance or straddling a roadway, but sometimes constructed in isolation as a standalone structure, or on a smaller scale as a local memorial to war dead. Although they can share architectural features with triumphal arches, memorial arches and gates constructed from the 20th century onwards often have the names of the dead inscribed on them as an act of commemoration.