Río Arriba is a barrio in the municipality of Arecibo, Puerto Rico.

In 1899, the United States Department of War conducted a census of Puerto Rico finding that the population of Río Arriba barrio was 1,709.

Barrios (which are, in contemporary times, roughly comparable to minor civil divisions)[13] in turn are further subdivided into smaller local populated place areas/units called sectores (sectors in English).

On September 27, 2017 it was reported that a week after Hurricane Maria hit Puerto Rico, roads into and out of Río Arriba remained blocked and inaccessible.

Residents were clearing the way with machetes and working with rescue crew to evacuate people who needed dialysis and emergency medical help.