Frederik Kaas (1730 10 September 1759) was a Danish naval officer who also saw service with other navies. He died in the Battle of Pondicherry in a French warship.
As the son of Admiral Ulrich Kaas (1677 - 1746) and Mette Sørensdatter Mathiesen, Frederik Kaas was christened at Holmens Kirke on 20 June 1730. He had four older brothers who would also become Danish naval officers. He never married. His family was one of the ancient nobility of Denmark, the Mur-Kaas.
From the age of twelve Frederik Kaas was enrolled as a cadet in the Royal Danish navy (officially from 1747) and was commissioned as a Junior Lieutenant on 27 December 1749. In 1750 he joined the Construction Committee
1751 -1754 he served on the ship-of-the-line Nellebladet in a voyage to the East Indies, at the end of which he was promoted to Senior Lieutenant and appointed adjutant to the head of the Holmen navy base, Admiral Suhm.
Early in 1776 promotion to captain gave him command of Hvide ÃÂrn (1753) which was active in a joint Danish-Swedish squadron in the North Sea
In 1757 Frederik Kaas was permitted to seek service in the French navy. He reported that he had arrived too late at Brest to join the squadron of Bois de la Motte, but in August he was posted to a warship of 74 guns which was sailing to the East Indies.
Frederik Kaas was killed in a battle with a British warship off Pondicherry on 10 September 1759.