Captain Woodley Francis Losack (5 October 1769 – 30 May 1838) was an officer of the British Royal Navy, who served during the French Revolutionary Wars and the Napoleonic Wars. He participated in the Battle of Tamatave (1811) as captain of HMS Galatea.
As a lieutenant, Losack served on HMS Ville de Paris, the flagship of Admiral William Cornwallis, and participated in the enterprise to cut out la Chevrette, a French corvette, of 20 nine-pounders and 350 men, from under the batteries in Camaret Bay, near Brest, on the night of 21 July 1801. Lieutenant Losack and Lieutenant Keith Maxwell were promoted to the rank of commander for their services in this enterprise.
In 1801,he was appointed captain and held the temporary command of the 36-gun fifth rate HMS Jason in the spring of 1801. On 1 May 1801, Jason captured la Dorade, a brig privateer of 14 guns and 51 men. Later that year, he was appointed Captain of HMS Helena (1804), an 18-gun sloop. On 5 June, 1805, the Helena captured the Santa Leocadia, a Spanish privateer of 14 guns and 114 men.