Santa Maria Regina Pacis a Ostia Lido is a 20th-century parochial church and titular church in Ostia, southwest of Rome, dedicated to Mary, Queen of Peace.^[2][3][4][5]

In 1916, it was suggested to Vincenzo Vannutelli, Bishop of Ostia, to construct a church to Our Lady, Queen of Peace, in order to pray for an end to the First World War.^[6]

The church was built in 1919–28. It has been visited by Pope Paul VI (1968), Pope John Paul II (1980)^[7] and Pope Francis (2015).^{[8][9][10][11]}

The church was made a titular church on 5 March 1973 to be held by a cardinal priest.^[12][13][14]

Titulars

• James Darcy Freeman (1973–1991)^[15]
• Paul Joseph Phạm Đình Tụng (1994–2009)^[16]
• Laurent Monsengwo Pasinya (2010–2021)^[17]
• William Goh Seng Chye (2022–present)

In basilica form with side chapels and transept. The nave is covered by a round vault divided into sections, sculpted by the lunettes of the side windows. The internal columns are 8 m (26 ft) high under the cornice, in imitation hammered travertine with octagonal plinths and Corinthian capitals.^[18]