- This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.
- Catalyst! Universe, a Star Wars original universe created by Jeanine Hennig
- Catalyst! a Star Wars novel zine by Jeanine Hennig
- Catalyst! Collected, a Star Wars anthology by Jeanine Hennig
- Catalyst a Babylon 5 novel
- Catalyst, a Sentinel novel
- Catalyst (Miraculous Ladybug), Nathalie Sancoeur as an akumatized villain