John Forbes was an architect active in the early-19th century. He is particularly noted for his neo-classical designs for the Pittville Pump Room (1825-30) and St. Paul's Church (1829-31) both in Cheltenham, England.
Forbes's architectural career was, however, only brief. It ended in 1835 after he was tried and found guilty of forgery. For this he was sentenced to transportation and was eventually imprisoned.
Colvin, Howard, A Biographical Dictionary of British Architects 1600-1840, 3rd edition (New Haven and London: Yale University Press, 1995), p. 370.