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:
- Already, in Finnish
It can also refer to the following fictional characters:
- A half-man, half-beast from Kirk Hallam