The Mariners selected Wilson's contract from Triple-A Tacoma on Friday.
Wilson will return for his second stint in the majors this season, this time with a different team in Seattle. The 31-year-old appeared in 21 games with Baltimore before being designated for assignment June 6. Wilson slashed .231/.348/.33 with one homer in 46 plate appearances with the Orioles. Seattle designated Miles Mastrobuoni for assignment in order to make room for Wilson on the roster.