Vavra signed a minor-league contract with the Orioles on Saturday, Jake Rill of MLB.com reports.
Vavra elected to become a free agent after being DFA'd by the Mariners on Aug. 31, and he'll now return to the organization that he's spent his entire major-league career with. The 27-year-old has slashed .239/.342/.358 across 191 plate appearances at Triple-A and will likely remain in the minors for the rest of the year.