Brigadier-General Armine Simcoe Henry Mountain CB (4 February 1797 – 8 February 1854) was a British Army officer who served as Adjutant-General in India.

Mountain was commissioned as an ensign in the 96th Regiment of Foot on 20 July 1815.

[1] He also saw action at the Capture of Chusan in October 1841, the Battle of Chinhai in October 1841 and the Battle of Ningpo in March 1842 as well as at the Battle of Chapu in May 1842 and the Battle of Chinkiang in July 1842.

[1] He also commanded a brigade at the Battle of Chillianwala in January 1849 and the Battle of Gujrat in February 1849 during the Second Anglo-Sikh War.

[1] He served as Adjutant-General in India from February 1849[2] until he died from illnesses following an attack of cholera in February 1854.