The Arbor Hill Historic District–Ten Broeck Triangle, originally the Ten Broeck Historic District, is a seven-block area located within the Arbor Hill neighborhood north of what is today downtown Albany, New York, United States. In 1979 its easternmost third, the Ten Broeck Triangle, the second oldest residential neighborhood in the city, was recognized as a historic district and listed on the National Register of Historic Places. Four years later, the district was increased to its current size and renamed to reflect its expansion to include some of the rest of Arbor Hill.