Francisco Arias (1533 – 15 May 1605) was a Spanish Catholic author, known as a writer of ascetical treatises.
Arias was born in Seville and joined the Society of Jesus at the age of twenty-six.
Arias was commonly regarded as a saint, and was known for his gift of prayer and his spirit of penance.
He was especially devoted to the care of blacks, Moors, and the inmates of hospitals and prisons.
Arias was held in high esteem by John of Avila, and his works are recommended by St. Francis of Sales in his Introduction to a Devout Life.