John Brown was an architect in Norwich, in the county of Norfolk, England. He is best known for his churches, especially cathedrals. He was also, along with his two sons, the surveyor for the Norwich Cathedral.

Some of his architectural works:

• St. Peter: Lowestoft, Suffolk; built 1833; white brick with no tower, Carpenter's Gothic style; demolished circa 1974
• St. Michael's (St. Michael the Greater): Stamford, Lincolnshire; built 1835–36; Early English style; extant, but no longer used as a church
• Sudbury workhouse: Sudbury, Suffolk; built 1836(–37?) after enactment of the Poor Law Amendment Act 1834
• The Norwich Yarn Factory: Norwich; built 1836–37
• Christ Church: East Greenwich, Greater London ; built 1847–49; Robert Kerr , co-architect
• St. Margaret: Lee, London; built 1839–41
• Christchurch: New Catton, Norwich ; built 1841
• St. Mark: New Lakenham, Norwich ; built 1844; modified perpendicular style
• St. Matthew: Thorpe Hamlet, Norwich ; built 1851; modern Norman style; Robert Kerr , co-architect; now offices
• The Old Corn Exchange: Fakenham, Norfolk; built 1855; now a movie theater