Internationalist may refer to:
- Internationalism (politics), a movement to increase cooperation across national borders
- Internationalist, socialists opposed to World War I
- The Internationalist Review, an e-journal founded in Maastricht
- The Internationalist, a magazine based in Seattle
- Internationalist (album), a 1998 album by Australian band Powderfinger
- A member of the International Brigades
- League for the Fourth International, whose most noteworthy section is the Internationalist Group in the United States
- New Internationalist, an international magazine that works for social justice