- 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.
- Atavachron, a piece of alien technology from Star Trek: The Original Series
- Atavachron, a Star Trek: TOS anthology by Kate Lach
- Atavachron, a Star Trek: TOS newsletter published in the 1980s
- Atavachron, a Star Trek: TOS letterzine published in the 1970s
- Atavachron Press, the publisher of To Invite the Night