Sir Arthur Farquhar KCH, CB, RSO (1772 – 2 October 1843) was an officer of the British Royal Navy.

He had scarcely, however, arrived in India when news of the outbreak of the French Revolutionary Wars led him to enter on board the sloop HMS Hobart, whence he was removed to the flagship, and in April 1798 was promoted to be lieutenant.

On his return to England as first lieutenant of HMS Heroine, he was employed in various ships on the home, Mediterranean, Baltic, and North Sea stations, until promoted to be commander on 29 April 1802.

A few days later, 8 April, Farquhar was advanced to post-rank; he afterwards was presented with a sword, value 100l., by the Patriotic Fund, and by the merchants of Malta with a piece of plate and complimentary letter, 19 September 1808.

From 1806 to 1809 he commanded the 20-gun HMS Ariadne in the Baltic and North Sea, during which time he captured several privateers, French and Danish.