Rittenhouse is a mysterious organization with an as yet unknown, but apparent, malicious intent. According to Garcia Flynn, the organization murdered his family and set him up to take the fall for the killings. They also seem to be using Rufus Carlin to record the team's missions, again for unknown reasons.
The organization was founded in 1778 by American clockmaker and astronomer David Rittenhouse.
The true intent or purpose of the Rittenhouse organization is currently unknown. It is hinted at, however, that they may have influenced certain key points in history to gain power and further their own interests, though this has not yet been validated. Rittenhouse remains largely, in all its aspects, a mystery.
It is revealed through Garcia Flynn and Agent Denise Christopher's investigations that Connor Mason had gone bankrupt roughly two years prior to the events of this series, and Rittenhouse secretly wired him $2.5 billion through a dummy corporation in the Cayman Islands to fund Mason Industries' time machine project. It is also revealed that Rittenhouse may be responsible for events such as the assassinations of John F. Kennedy and Martin Luther King Jr. and that their true goal is to use time machines to go back and change everything so they can be in control because they have lost much control over the years.
- David Rittenhouse (founder, deceased)
- Benedict Arnold (founding member, deceased)
- John Rittenhouse (deceased)
- Henry Ford (deceased)
- Thomas Edison (deceased)
- J. P. Morgan (deceased)
- Charles August Lindbergh (deceased)
- Charles Lindbergh (deceased)
- Julian Charvet (deceased)
- William Hale Thompson (deceased)
- Joseph McCarthy (deceased)