Unterseeboot 81
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Unterseeboot 81 or U-81 has been the name of two German submarines or U-boats during the First World War and the Second World War.
- Unterseeboot 81 (1916) was launched in 1916 and operated in the First Battle of the Atlantic during the First World War. She was sunk in 1917 by HMS E54.
- During the First World War, Germany also operated another U-boat with a similar designation:
- Unterseeboot B-81 was built in 1917 and was sunk later that year.
- During the First World War, Germany also operated another U-boat with a similar designation:
- Unterseeboot 81 (1941) was launched in 1941 and operated during the Second Battle of the Atlantic during the Second World War. She was sunk in 1944.

