Happo may refer to:

• Masan, formerly Happo, city in South Korea
• Happō, Akita, town in Japan

• M. S. Vector
• M.S. Vector
• MS Vector
• M/S Vector
• MS Veronica
• MS Viking
• MS Viking 2
• MS Viking 5
• MS Viking Sky
• MS Visby (1980)
• M. S. Vishwanathan
• MS Vision of the Seas
• M.S. Viteles
• MSV Norte
• MS Voyager of the Seas
• M/S Västan
• M Swaraj
• M. Swaraj
• Mswati III of Eswatini
• M. S. Whitcomb Farm
• M. Swift and Sons Company
• Mswin
• MS Windows 1
• MS Windows 1.0
• MS Windows 2.0