Blessed Mattia de Nazarei (1 March 1253 – 28 December 1319) was an Italian Roman Catholic nun of the Poor Clares.

At the age of eighteen she was put into an arranged marriage and when she heard she fled home to the convent of Santa Maddalena at Matelica.

[3][4] Mattia de Nazarei gained a reputation for holiness and was regarded as a saint.

The cause of canonization culminated with her beatification on 27 July 1765 after Pope Clement XIII confirmed her cult.

She must be declared Venerable with the recognition of her life of heroic virtue before the investigation into the miracle for canonization can occur.