Thomas Marsh Nelson (c. 1817 - 24 February 1884) was an English architect who worked principally in London.
He was particularly active in the development of Westbourne Terrace in the 1840s on behalf of the builder William Kingdom.
[3] He married Julia Satara Briggs, daughter of General John Briggs and Jane Dodson, on 10 November 1852 at St. George Hanover Square, London.
[4] In 1838 he gave evidence before the Select Committee of the House of Commons on Metropolis Improvements in relation to the need for new streets in the centre of London to improve traffic flow.
[5] In 1841 he was living or working from 3 Charles Street, St James, London.