Mason, an unrestricted free agent, agreed to a two-year contract with the team that he joined in 2005.
But now Mason, 36, is set to end his career in Baltimore, and his return assures third-year quarterback Joe Flacco a familiar target to go with Stallworth and Boldin.
"This is outstanding, just great news for the Ravens," Ravens coach John Harbaugh said of Mason's return. "Our coaches are happy. Derrick's teammates are happy, and you know Joe is smiling. ... We would have lost something special if Derrick had gone to another team. We have gotten better in the last couple of days."
Mason had 73 receptions for 1,028 yards and seven touchdowns in 2009. He started all 16 games for Baltimore and became the 23rd player in NFL history with 800 career catches.
Instead, Mason will spend the next few months preparing for his 14th NFL season.
"I'm getting myself ready to play football and help the Ravens win," he said. "But the first thing I am going to do is take my family on vacation. I'll see everybody back in Baltimore soon."
That should change in 2010 with the addition of Boldin and Stallworth, along with the re-signing of Mason.
"We know exactly what we're getting with Derrick and that's production," Ravens general manager Ozzie Newsome said. "Every Ravens fan knows what Derrick brings to this team. It's reliability, toughness, leadership, the fight to win, the want of the ball in the clutch times. He has a two-year history with Joe that says 'we know how to produce together.' They are on the same page."
Copyright 2010 by The Associated Press