San Pedro de Inacaliri River

{{Infobox river

| name = San Pedro de Inacaliri River

| image = Volcán_Paniri,_Chile,_2016-02-09,_DD_23.JPG

| image_caption = San Pedro River and Paniri volcano

| source1_location =

| mouth_location = Loa River

| subdivision_type1 = Country

| subdivision_name1 = Chile

| length = {{convert|76|km|abbr=on}}

| source1_elevation =

| discharge1_avg = {{convert|0.2|m3/s|abbr=on}}

| basin_size = {{convert|9,850|km2|abbr=on}}

| tributaries_left = Silala River

}}

San Pedro de Inacaliri River, or called simply San Pedro River, is a river of Chile located in El Loa Province, Antofagasta Region. It begins at the confluence of the rivers Silala and Cajón, at an elevation over 4,000 m asl.

A part of its flow is diverted (between 50 and 60 L/s) and conducted across the desert to Chuquicamata for domestic water supply. About 8 km south, the waters of the river disappear in a floodplain area to reappear 15 km downstream at the so-called Ojos del San Pedro in the form of a partially overground stream, at the eastern border of a salt flat with a surface of 5 km².

File:Río-loa-(origen).svg

Before discharging into Loa River, the river skirts the San Pedro volcano, where it has carved a 100-m-deep canyon through a rhyolite lava flow.