All Saints, Margaret Street, is a Grade I listed Anglican church in London. The church was designed by the architect William Butterfield and built between 1850 and 1859. It has been hailed as Butterfield's masterpiece and a pioneering building of the High Victorian Gothic style that would characterize British architecture from around 1850 to 1870. The church is situated on the north side of Margaret Street in Fitzrovia, near Oxford Street, within a small courtyard.