John Thomas Micklethwaite (3 May 1843 – 28 October 1906) was an English architect. He was born at Rishworth House, Bond Street, Wakefield, Yorkshire (which stood on the site of what is now County Hall, Wakefield) to James Micklethwaite of Hopton, Mirfield, a worsted spinner and colliery owner, and his wife, Sarah Eliza Stanway of Manchester. He grew up in the Micklethwaite family’s ancestral home at Hopton Hall and was educated in Tadcaster and Wakefield. After moving to London where he attended King’s College, he was apprenticed, in 1862, to George Gilbert Scott, commencing independent practice in London in 1869.