Julia of Certaldo (1319?-1370) was an Augustinian Secular who devoted herself to prayer and penance.
Born Julia della Rena in Certaldo, Italy, around 1319, she was orphaned while a young child. She went to Florence, where she found employment as a maid.
She became an Augustinian Secular in 1337. Later she was able to return to Certaldo, where she lived a life of solitude, penance and prayer for 30 years. People of the town revered her for her holiness during her life there.
She died in Certaldo in 1370. Her remains are preserved there at the Church of Saints Michael and James.