John Houlton Marshall (9 October 1768 in Halifax, Nova Scotia – 2 May 1837 in Charlotte Street, Bloomsbury Square, Middlesex) was a Nova Scotian who was a naval officer at the Battle of Trafalgar during the Napoleonic Wars.

Marshall was still serving in Naiad on 17 May 1801 when he commanded a cutting out expedition at Pontevedra which captured the Spanish packet l'Alcudia and destroyed her consort El Raposo.

[3] On 13 July 1804 he joined the 100-gun ship of the line HMS Britannia, and he fought on board her at the Battle of Trafalgar on 21 October 1805.

By 1810 Marshall was serving as first lieutenant of HMS Africa and on 21 October he was promoted to commander at a ceremony held to commemorate the Battle of Trafalgar.

He was later given command of the 18-gun brig-sloop HMS Halcyon, and survived her sinking on 19 May 1814 on reef rocks in Anato Bay, Jamaica.