Subcategories - Ships, Naval History
- Hernán Cortés
- Hernando de Soto
- Hudson Explores Hudson Bay
- Husband Edward Kimmel
- Hyman G. Rickover
- Iceberg Sinks “Unsinkable” Ocean Liner Titanic
- Illyrian Wars
- Iraqi Missiles Strike U.S. Navy Frigate Stark
- Isaac Hull
- Isoroku Yamamoto
- Jacques Cartier
- Jacques Cartier Claims St. Lawrence River Valley for France
- James Bruce
- James II
- Jean Bart
- John Cabot
- John Davis
- John Fisher
- John Fitch
- John Jellicoe
- John Paul Jones
- John Smith
- Juan Ponce de León
- Karl Dönitz
- Khair ed-dīn
- Lapita Culture Colonizes the South Pacific
- Launching of the Dreadnought
- Lord Anson
- Lord Nelson
- Lord Palmerston
- Louis Jolliet
- Louis Mountbatten
- Louis-Antoine de Bougainville
- Lysander
- Maarten Tromp
- Maarten Tromp and Cornelis Tromp
- Mackenzie Reaches the Arctic Ocean
- Magellan Expedition Circumnavigates the Globe
- Marines
- Matthew C. Perry
- Military History of the Athenian Empire
- Military Transport
- Monitor Battles the Virginia
- Monitor vs. Virginia
- Naval Law of Themistocles Is Instituted
- Naval Weapons
- Navies: Organization and Tactics
- The Navigation Act and the Outbreak of the Dutch Wars
- Navy
- New Zealand Closes Ports to U.S. Nuclear Warships
