Havmanden-class submarine

Havmanden-class submarine may refer to:


 * Havmanden-class submarine, a class of submarines built for the Royal Danish Navy from 1911 to 1914
 * Havmanden-class submarine or U-20-class submarine, a class of submarines built for the Austro-Hungarian Navy during World War I
 * Havmanden-class submarine, a ship class of World War II