Jo can mean:

• A four-foot long wooden staff, used in some Japanese martial arts. See Jo (weapon), and quarterstaff.
• One of Louisa May Alcott's fictional characters in Little Women and its sequels.
• A german slang-word for yes.
• A Scots word meaning "loved one".
• A Japanese given name (Jō). It can refer to the following people:
  • Joe Hisaishi
  • Jo Kamisaku
• It can also refer to the following fictional characters:
  • Joe Kido of Digimon
• Already, in Finnish
• A Star Wars game called Jedi outcast.