This thesis examines the architectural commissions undertaken by three Victorian architects - Richard Cromwell Carpenter (1812-55), William Slater (1819-72) and Richard Herbert Carpenter (1841-1893) - who traded under their own names, but also as Slater & Carpenter (1863-72), and as Carpenter & Ingelow (1875-93). The three architects were much connected with the "High Church" movement within the Church of England, especially Richard Cromwell Carpenter who was one of the favoured architects of the Cambridge Camden Society; an organization which attempted to give structural expression to the liturgical and doctrinal ideals which emanated from the Oxford Movement. Little previous research has been undertaken on any of these individuals though each was considered an important architect by their contemporaries; being collectively responsible for a vast range of ecclesiastical commissions, including designs for Cathedrals, parish churches, schools, and clergy houses, in addition to a litany of other commissions both large and small. This thesis considers each of the main types of work, but it also examines certain themes. Hence, one chapter examines the schools which were designed while also considering how architectural style changed with time. Another examines the parsonages which were planned while also considering the educational backgrounds of the relevant clergy, while the chapter that considers the great houses also seeks to identify any linkage between architectural style and the hierarchical position of the patron The words which follow are based on extensive research into primary and secondary sources; archives at Lambeth Palace, Lancing College, County Record Offices and the major copyright libraries. The thesis aims to make a significant contribution to the study of Victorian church-building, and to the documentation of Victorian ecclesiology.