St Gabriel's, Pimlico is an Anglo-Catholic parish church of the Church of England located in Warwick Square, Pimlico, London. It lies within the Deanery of Westminster (St Margaret) within the Diocese of London. Designed by Thomas Cundy (junior), it was constructed between 1851 and 1853 as part of Thomas Cubitt's development of the area on behalf of the Marquess of Westminster. It is a Grade II* listed building.
The Introit (from Latin introitus 'entrance') is part of the opening of the liturgical celebration of the Eucharist for many Christian denominations. In its most complete version, it consists of an antiphon, psalm verse and Gloria Patri, which are spoken or sung at the beginning of the celebration. It is part of the proper of the liturgy: that is, the part that changes over the liturgical year.
In the Roman Rite of the Catholic Church it is known as the antiphona ad introitum (Entrance antiphon), as in the text for each day's Mass, or as the cantus ad introitum (Entrance chant) as in the General Instruction of the Roman Missal, 47 and the First Roman Ordo (sixth to seventh century). In pre-1970 editions of the Roman Missal, the word Introitus was used, distinguished from the normal meaning of the word (entrance) by being capitalized. In Ambrosian chant and Beneventan chant, the counterpart of the Introit is called the ingressa.The Lutheran rite uses the term Introit in the same fashion, marking the opening of the Mass. In the Mozarabic, Carthusian, Dominican, and Carmelite Rites, it is called the "officium".
Warwick Square is a garden square in the Pimlico district of London SW1. The church in the square, St Gabriel's, is listed Grade II*. The other buildings fronting the square are listed Grade II on the National Heritage List for England. The private gardens at the centre of the square are Grade II listed on the Register of Historic Parks and Gardens.