''Havmanden''-class submarine

Havmanden-class submarine may refer to one of these types of Royal Danish Navy submarines:

• Havmanden-class submarine (1911), later also known as the A class; six submarines built 1911–1914; remained in service until 1928–1932
  • The Austro-Hungarian Navy's U-20-class submarine, based on the 1911 Danish class, is sometimes referred to as the Havmanden class
• Havmanden-class submarine (1938), also known as the H class; four of five planned boats built 1938–1942; all scuttled in 1943