Niamh Connor is the latest of the club's promotion-winning squad to sign up for the 2026/27 campaign.
Connor, who scored eight goals in all competitions last season in 23 appearances as Posh secured automatic promotion, follows in the footsteps of a number of other players to commit their future to the club.
The centre back is one of just six players to reach 100 appearances for the club and currently sits in fourth place on the all-time list behind Keir Perkins, Meg Lawlor and Jessica Stanford.
Manager Jake Poole said: "Niamh's journey at the club is one we are proud of and we are delighted she continues that journey with a new challenge at a new level."
Connor said: "I am so proud to be representing this team for another year. I am looking forward to exciting times ahead going into the new season with new challenges and faces."
If you wish to sponsor any of our promotion-winning squad, please email jenny.melling@theposh.com