Puerta de Tierra is a subbarrio occupying the eastern portion of the Islet of San Juan and the barrio of San Juan Antiguo in the municipality of San Juan, Puerto Rico. The name Puerta de Tierra derives from the former eastern gated entrance to the walled city of San Juan where Plaza Colón is today. With a population of 2,924 as of 2010, this is the most populated area of San Juan Antiguo. On October 15, 2019, it was added to the National Register of Historic Places.