Mariota was the last unsigned first-round pick from this year's NFL Draft, as the two sides have been at odds over offset language. This allows a team to capture guaranteed money if a player is released and signs elsewhere.
The Titans and Mariota agreed to partial offset language.
Tennessee reports to training camp on July 30th and they will have their first practice July 31st. The Titans' top pick will battle Zach Mettenberger to be the team's starting quarterback heading into the season.
Cornerback D'Joun Smith and defensive end Henry Anderson of the Indianapolis Colts remain the only two unsigned draft picks.
The Titans tweeted out a picture of the signing of the former Oregon quarterback and Heisman Trophy winner. Mariota thanked the organization and his agent, as he expressed his excitement to be a part of the team.