Robert Cooke Fenwick (6 October 1882—13 August 1912) was a British aircraft pioneer and designer.
After school, he became an aircraft designer.
He worked at Planes Limited and worked on the Handley Page Type B, later redesigning it into the Planes Limited Biplane.
He is known for designing and building the Mersey Monoplane, which competed in trials at the British Military Aeroplane Competition, on Salisbury Plain in 1912.
On 13 August 1912, Fenwick lost control of his Mersey monoplane and it crashed, killing him in the process.