Jason Witten’s days as a Cowboy are over.

The Pro Bowl tight end is calling it a career after 15 seasons in Dallas, officially joining ESPN as an analyst for “Monday Night Football,” according to the network’s Todd Archer.

“Jason Witten has informed Cowboys owner and general manager Jerry Jones and coach Jason Garrett that he will retire, according to multiple sources,” Archer tweeted Thursday morning.

The Post’s Andrew Marchand confirmed the report. ESPN is declining comment.

Whispers of Witten’s impending retirement emerged last week, with the 35-year-old expected to replace Jon Gruden in the booth, after the long-time commentator left to coach the Oakland Raiders.

Witten concludes his NFL career as the Cowboys’ all-time leader in receiving yards, 12,448, and third in touchdowns with 68.