Stefano di Giovanni, known as il Sassetta, (Siena 1392 – 1450 or 1451) was an Italian painter. He was born in Siena, although there is also an hypothesis that he was born in Cortona. However, the first historical record of him was in Siena in 1423. Di Giovanni was probably the apprentice of Paolo di Giovanni Fei although it is also thought that he may have studied under Benedetto di Bindo. He painted in the semi-archaic Sienese School style of painting. Francesco di Giorgio e di Lorenzo, better known as Vecchietta, is said to have been his apprentice.