Girolamo Maiorica (Portuguese: Jerônimo Majorica; chữ Nôm: 梅烏理哥; Vietnamese alphabet: Mai Ô Lý Ca; 1591–1656) was a 17th-century Italian Jesuit missionary to Vietnam. He is known for compiling numerous Roman Catholic works written in the Vietnamese language's demotic chữ Nôm script, both on his own and with assistance from local converts. Maiorica was one of the first authors of original Nôm prose. His works are seen as a milestone in the history of Vietnamese literature.
Maiorica was born in Naples, probably in 1581, 1589, or 1591. He entered the Jesuit order on 19 May 1605. He was ordained a priest by Cardinal Robert Bellarmine in Rome before heading to Lisbon en route to the Far East in 1619.
Maiorica initially stopped in Goa, then arrived in Macau with the intention to proselytize in Japan. However, by 1619, Japan had begun persecuting Christians, so he went instead to Makassar and remained there for a year. Afterwards, he returned to Macau and traveled to Fai-Fo (present-day Hội An) in 1624 in the same boat as Alexandre de Rhodes, João Cabral, and two or three other Jesuits. Whereas de Rhodes studied Vietnamese under Francisco de Pina (1585–1625), Maiorica studied Vietnamese at the Jesuit residence in Nước Mặn (today An Nhơn District, Bình Định Province). He proselytized in Đàng Trong (Cochinchina) from 1628, when his superiors sent him back to Macau en route to a new assignment in Japan. He was again unable to make the journey, this time due to poor weather. In 1630, he traveled to Champa, where he was quickly imprisoned. After a Portuguese merchant ransomed him, Maiorica made his way to Cửa Hàn (Danang) via Cambodia.