Trey Mancini is doing more than just retiring from baseball this year.

He’s retiring as an Oriole.

Mancini is signing a one-day contract on Sept. 19, when the club hosts the Brewers in a 4:05 p.m. game at Camden Yards.

The occasion will include a pregame ceremony to celebrate Mancini’s career, which began with the Orioles drafting him in 2013 out of Notre Dame and continued with his major league debut three years later.

Mancini finished third in American League Rookie of the Year voting the following season. He played in 701 games with the Orioles, batting .270/.334/.463 with 117 home runs, before they traded him to the Astros at the 2022 deadline.

Former teammates, coaches, staff members, medical professionals and others will participate in the Sept. 19 festivities. Mancini will throw out the ceremonial first pitch.

“Retiring as an Oriole means the world to me,” Mancini wrote in a text message. “I spent 10 years in the Orioles organization and I am beyond thankful for every single one of them. I will always feel a deep connection with the Orioles fans and to the city of Baltimore, and to retire as a member of the organization is a dream come true.”

Mancini hadn’t played in the majors since 2023 until the Angels selected his contract on June 8. He appeared in five games, going 4-for-13 with a triple and four RBIs before they designated him for assignment.

After refusing an outright assignment, Mancini made the decision to retire and announced it on Aug. 18. He wanted to spend more time at his Nashville home with wife Sara Perlman and daughter Sadie, who was born in October.

Mancini earned a World Series ring with the Astros and left with a career .263/.327/.448 line, including 156 doubles, 12 triples, 129 homers and 404 RBIs in 3,396 plate appearances. He was a fan favorite in Baltimore and became an inspiration after a Stage 3 colon cancer diagnosis in March 2020 that kept him out for the entire season.

He returned in 2021, was runner-up to Pete Alonso in the Home Run Derby and won the AL Comeback Player of the Year Award.

“For the adversity he faced in this game, it’s really special what he was able to overcome,” Alonso said during the last homestand. “Not just in a baseball sense, but in life. That’s really special, and something that him, his family and every team that he played for should be proud to have him and represent their organization and their city because his entire career, he’s been a class act.

“For him to say goodbye, obviously bittersweet, but he had some really incredible moments, and congratulations.”

Fans will have an opportunity to buy a ticket package for the Sept. 19 game that includes a hat with the “F16HT” logo, which the Orioles put on a T-shirt after his diagnosis to benefit the Colorectal Cancer Alliance Patient and Family Support Services.

A portion of the proceeds will be donated to The Trey Mancini Foundation, which offers support to anyone with food insecurity, illness and other hardships. The special ticket packages start at $33 and can be purchased at Orioles.com/Mancini.

The ceremony also will include the relocation of the “F16HT” sign from the home dugout tunnel to the Club Level archives. A new sign will be unveiled in the dugout.

There’s more. Mancini will participate in a pregame kids-only autograph session for youths 12 and under at the ADA platform in Section 16. And some fans will be selected to engage in the on-field ceremony.