|Shipyard||A.G. Weser, Bremen (Werk 284)|
|Ordered||23 Sep 1916|
|Laid down||21 Jan 1917|
|Launched||3 Oct 1917|
|Commissioned||31 Oct 1917|
|Fate||26 Nov 1918 - Surrendered to France. Broken up at Brest in 1921.|
UB 84 was rammed and sunk in Eckernforde Bay on December 6, 1917, by the torpedo target ship Solingen. Seven crew members in the engine room were killed. UB 84 was raised and repaired with the intention of returning her to front-line service.