HMS Surly was a mortar vessel of the Royal Navy built at Blackwall Yard in 1855. Later that year she served with Anglo-French forces at the Bombardment of Sweaborg, Finland, during the Crimean War. Her mortar, and those of the other vessels deployed, required several repairs but the bombardment had a greater effect than had been anticipated. Despite this mortar vessels fell out of use in the Royal Navy due to the development of rifled artillery. After being renamed MV9 later in 1855 she was broken up in November 1863.