Thor is the name of planets in multiple works of science fiction.
- Poul Anderson's novel The Long Way Home
- H. Beam Piper's novel Little Fuzzy, brief reference
- L. Sprague de Camp's short story and collection The Continent Makers (Epsilon Eridani)
- James Blish's Cities in Flight universe (Thor V)
- John Barnes's A Million Open Doors (Thorburg)