Lists of U-boats cover U-boats, military submarines operated by Germany, particularly in the First and Second World Wars.

• List of German U-boats
• List of U-boat types of Germany
• List of U-boat flotillas of Germany
• List of U-boats never deployed of World War II Germany
• Uncompleted U-boat projects of World War II Germany
• List of most successful German U-boats of Germany for kill tonnage in World War I and World War II
• Foreign U-boats of World War II Germany
• List of Austro-Hungarian U-boats