Sir Thomas Graham Jackson, 1st Baronet RA (21 December 1835 – 7 November 1924) was one of the most distinguished English architects of his generation. He is best remembered for his work at Oxford for Oxford Military College as well as the University, notably: the Examination Schools, most of Hertford College (including the Bridge of Sighs over New College Lane), much of Brasenose College, a range at Trinity College, and the Acland Nursing Home in North Oxford. Much of his career was devoted to the architecture of education and he worked extensively for various schools, notably Giggleswick and his own alma mater Brighton College. Jackson designed the former town hall in Tipperary Town, Ireland. He also worked on many parish churches and the college chapel at the University of Wales, Lampeter. He is also famous for designing the chapel (amongst other things) at Radley College. The City of Oxford High School in George Street, Oxford was another building designed by him.

In 1919, Jackson wrote a collection of supernatural stories, Six Ghost Stories. These stories were written under the influence of M.R. James, and Jackson expressed admiration for James' work in the book's introduction.