John Douglas (1830–1911) was an English architect based in Chester, Cheshire. His designs included new churches, alterations to and restoration of existing churches, church furnishings, new houses and alterations to existing houses. He also designed a variety of other buildings, including shops, banks, offices, schools, memorials and public buildings. His architectural styles were eclectic, but as he worked during the period of the Gothic Revival, much of his work incorporates elements of the English Gothic style. Douglas is probably best remembered for his incorporation of vernacular elements in his buildings, especially half-timbering.