| Frederik Kaas | |
| Birth Date: | 1730 (baptised 20 June) |
| Death Date: | 10 September 1759 |
| Birth Place: | Copenhagen |
| Death Place: | Pondicherry, India |
| Allegiance: |  Denmark–Norway (1739-1759) |
| Branch: | Royal Dano-Norwegian Navy |
| Serviceyears: | 1739 -1759 |
| Rank: | Lieutenant |
| Battles: | Pondicherry |
Frederik Kaas (1730 - 1759)[1] 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.[2] 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[1] [3]
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.[1]
Early in 1776 promotion to captain gave him command of Hvide Ørn (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.[4] 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.[1]
Frederik Kaas was killed in a battle with a British warship off Pondicherry on 10 September 1759.[1]