James William Dewar (9 September 1827 – 19 July 1861) was an English first-class cricketer and British Army officer. The son of Sir James Dewar and his wife, Clementine Wemyss, he was born in British India at Bombay in September 1827. He was educated in England at Winchester College. After leaving Winchester, Dewar purchased a commission as an ensign in the 49th Regiment of Foot in 1846. He purchased the rank of lieutenant in April 1850, with Dewar marrying Kate Jane Dayrell in November of the same year. He served in the British Army in the Crimean War, during which he was present for the Battle of the Alma, the Battle of Inkerman and the Siege of Sevastopol. In the second year of the war, he was promoted to the rank of captain. Following the end of his first marriage, he married Benares A