Henry Martens (b. 1790, London; d. 1868, London) was an English military illustrator and artist. He created works for the firm of Rudolf Ackermann who ran the Eclipse Sporting Gallery at 191 Regent Street. The majority of these depicted military uniforms and battle scenes, particularly images of the Sikh Wars and the Kaffir Wars. He worked mainly in water-color although a few oil paintings do exist. Little is known about Martens' career beyond his work for Ackermann.