Christ Church is an Anglican church in the town and seaside resort of St Leonards-on-Sea, part of the Borough of Hastings in East Sussex, England. Opened as the town's third Anglican church in 1860 to serve a rapidly developing residential area and to accommodate poor worshippers who could not afford pew rents at the fashionable St Leonard's and St Mary Magdalene's Churches, the original building was superseded by a much larger church built next to it between 1873 and 1875. Prolific ecclesiastical architect Sir Arthur Blomfield's simple Gothic Revival design forms a landmark on one of St Leonards-on-Sea's main roads, continues to serve a large area of the town and maintains a strong Anglo-Catholic tradition. It has been described as Blomfield's "finest achievement in Sussex" and "one of the main centres of Anglo-Catholic worship in Southern England". The interior fittings are the best of any church in the borough, and the design has been called one of Blomfield's most successful. St John the Evangelist's Church, founded as a daughter church nearby in 1865, also continues to thrive as a separate parish church. Historic England has listed Christ Church at Grade II* for its architectural and historical importance.

Sir Arthur William Blomfield was an English architect. He became president of the Architectural Association in 1861; a Fellow of the Royal Institute of British Architects in 1867 and vice-president of the RIBA in 1886. He was educated at Trinity College, Cambridge, where he studied Architecture.