E. Mahoney and Son was an architectural business consisting of Edward Mahoney (1824 or 1825 – 28 April 1895) and his son and architectural partner, Thomas Mahoney (1855–1923), who were prominent New Zealand architects based in Auckland. They were able exponents of Gothic Revival and other styles, especially built in wood, but also in masonry and concrete. They designed numerous public (especially churches, notable examples of which are Our Lady of the Assumption Catholic Church, Onehunga, Church of St John the Baptist, Parnell, St Patrick's Cathedral, Auckland and the Church of the Holy Sepulchre, Khyber Pass Road and private buildings, many of which are still standing. They made a considerable contribution to Auckland's architectural heritage.