Santa Maria Causa Nostrae Laetitiae is a modern parish church at Piazza Siderea 1a in the suburb of Torre Gaia, south of Via Casilina.
The dedication is to the Blessed Virgin Mary under the title of Our Lady, Cause of Our Joy.
The actual locality is called the Villaggio Breda, after an arms company which built a settlement for its workers here and which donated the land for the church. This was designed by Tullio Rossi and opened in 1941.
It is an ordinary rectangular building, with a semi-circular external apse and a pitched and tiled roof. There is an aisle on the right hand side only, with a row of six arched windows in the nave wall above. The large external narthex has three square apertures separated by a pair of squat square pillars, and these support a tiled roof which is pitched and also hipped at the sides. Above this, the main façade of the church has four pilasters without capitals supporting a triangular pediment, two of them on the corners. The pilasters are painted in a tan yellow, and the background in a cream colour. There is a central round-headed window with a simple rectangle and circle design in dark and pale blue glass, and in the pediment is an icon of Our Lady. The aisle has a pitched roof, and its own unadorned entrance to the right of the narthex.
The church is situated on a pedestrian piazza which is approached from the street by steps. To the left there is a convent building attached, although there is no community in residence and the parish is administered by diocesan clergy. There is no campanile.