Zoila Augusta Emperatriz Chávarri del Castillo (Ichocan, Perú, 13 de setembre de 1922 - Los Angeles, Califòrnia, 1 de novembre de 2008) o més coneguda com Yma Súmac, fou una cantant nascuda a Perú. Al 1955 va rebre el Guiness World Record per el rang vocal més ampli del panorama musical, arribant a les 5 octaves, en un moment en el que el registre mitjà de les cantants d’òpera era de dos octaves i mitja.

Yma Sumac (born Zoila Augusta Emperatriz Chávarri del Castillo, September 10, 1923 – November 1, 2008), was a Peruvian–American coloratura soprano. In the 1950s, she was one of the most famous exponents of exotica music.

Sumac became an international success based on her extreme vocal range. She had six and a half octaves according to some reports, but other reports (and recordings) document four and a half at the peak of her singing career. (A typical trained singer has a range of about three octaves).