The 25-year-old forward joined the club when the Women's team was formed in July 2018 and has made 48 appearances in all competitions for the Reds, scoring 22 goals.
Jess Sigsworth said:
“I love this club; as a kid growing up supporting Manchester United it was always a dream for me to one day be a part of its amazing history. Signing a new deal is a proud moment for me and I am really excited to continue my journey here. I just can’t wait to be back out there playing for the badge next season.”
Casey Stoney said:
“Jess is United through and through, so it’s great to see her sign a new contract with the club.