William Mitchell (20 November 1803 – 3 August 1870) was a Church of England priest who was the second ordained person, after Louis Giustiniani, to provide religious services in the Swan Valley area of the Swan River Colony. He worked in the Swan Parish for over 20 years before moving to Perth to take up a position working with convicts and prisoners in the Perth Gaol in Beaufort Street.
Mitchell was the first rector of the Swan Parish, an area which extended north to Gingin and Chittering and east to Toodyay and York. The southern boundary included Guildford and Midland.