Chimborazo (Spanish: [tʃimboˈɾaso] ^ⓘ) is a stratovolcano in Ecuador and the Cordillera Occidental range of the Andes. Its last known eruption is believed to have occurred around AD 550. Although not the tallest mountain in the Andes or on Earth relative to sea level, its summit is the farthest point on Earth's surface from the Earth's center due to its location along the planet's equatorial bulge. Chimborazo's height from sea level is 6,263 m (20,548 ft), well below that of Mount Everest at 8,849 m (29,032 ft).

Chimborazo is the highest mountain in Ecuador and the 39th-highest peak in the entire Andes.

Several theories regarding the origin of the name Chimborazo exist. In many dialects of Quechua, "chimba" means "on the other side" as in "on the other side of the river" or "on the opposite bank". Other dialects pronounce this word "chimpa". Also, "razu" means "ice" or "snow". Local Quichua speakers say that Chimborazo is a Hispanicized pronunciation of "chimbarazu", meaning "the snow on the other side". Another theory suggests it is a combination of the Cayapa Schingbu for Women and the Colorado/Quichua Razo for Ice/Snow resulting in Women of Ice. According to another, Chimbo is Shuar for Throne of Master/God resulting in Icethrone of God. The locals also used to call the mountain Urcurazu, with the Quichua Urcu for Mountain resulting in Mountain of Ice. In local indigenous mysticism, Chimborazo represents Taita (Father) whereas neighbouring Tungurahua is seen as Mama, and Guagua (Child) for Pichincha hence Taita Chimborazo, Mama Tungurahua and Guagua Pichincha.

Chimborazo is in the Chimborazo Province of Ecuador, 150 km (93 mi) south-southwest of the city of Quito, Ecuador. It is a neighbor to 5,018 m (16,463 ft) high Carihuairazo, another inactive stratovolcano. Chimborazo's summit rises 2,500 m (8,202 ft) above the surrounding highlands (~3,500 to 4,000 m (11,483 to 13,123 ft)) with a ≈20 km (12 mi) wide base.

Under clear conditions, the summit of Chimborazo can be seen from the coastal city Guayaquil, nearly 140 km (87 mi) away. The nearest cities are Riobamba (~30 km to the southeast), Ambato (~30 km to the northeast) and Guaranda (~25 km to the southwest). Chimborazo is surrounded by the Reserva de Producción Faunistica Chimborazo, which forms a protected ecosystem to preserve the habitat for the Andes native camelids of vicuña, llama and alpaca.

Chimborazo is at the main end of the Ecuadorian Volcanic Arc, northwest of the town of Riobamba. Chimborazo is in la Avenida de los Volcanes (the Avenue of Volcanoes) west of the Sanancajas mountain chain. Carihuairazo, Tungurahua, Tulabug, and El Altar are all mountains that neighbor Chimborazo. The closest mountain peak, Carihuairazo, is 5.8 mi (9.3 km) from Chimborazo.^{[citation needed]} There are many microclimates near Chimborazo, varying from desert in the Arenal to the humid mountains in the Abraspungo valley.

The top of Chimborazo is covered by glaciers, with some northeastern glacier arms flowing down to 4,600 m. Its glacier is the source of water for the population of the Bolivar and Chimborazo provinces of Ecuador. Chimborazo glacier's ice mass has decreased over the past decades, which is thought to be due in part to ash cover from recent volcanic activity at Tungurahua.

Chimborazo's glacial ice is mined by locals (the so-called Hieleros from Spanish Hielo for Ice) to be sold in the markets of Guaranda and Riobamba. In earlier days, the people transported ice for cooling uses down to coastal towns such as Babahoyo or Vinces.