Biagio Betti (1535–1605) was an Italian painter of the late-Renaissance or Mannerist period.
He became, in 1557, a monk of the order of the Theatines of San Silvestro al Quirinale, and his works are principally confined to the monastery of that order in Rome.
In Rome, he became a pupil of Daniele da Volterra.
In the refectory of the Theatine monastery, he painted the Miracle of the Loaves and Fishes which was restored by Paolo Anesi in 1847; and in the library, Christ disputing with the Doctors.
This article about an Italian painter born in the 16th century is a stub.