Parish of Holy Trinity, Brompton , Church of England

The church was built between 1826 and 1829 on a site of three and a half acres just west of Brompton Square, including its burial ground, which was previously the burial site for Saint George's Hospital. It was designed by T.L. Donaldson and extended between 1879 and 1882 by Arthur Bromfield. The design consisted of a 5-bay clerestoried nave with two aisles, a sanctuary flanked by vestries and a west tower with lobbies on either side containing stairs to galleries. The windows were lancets (without tracery until 1843). The materials consist of stock bricks with Suffolk facings and Bath stone dressings. The roofs were of Bangor slates hidden behind coping stones. There was much criticism immediately; the church wardens wanted architectural ornaments and many were subsequently added.

It was consecrated in 1829 and that year a large district was assigned to it - west as far as Kensington Canal and north to Kensington Turnpike. In 1977 Saint Paul's Onslow Square was united with Holy Trinity.