Jordan Nobbs has signed an 18-month contract with the option to extend it for another year.
She won 12 trophies and three WSL titles during her time at the helm of the club.
She had 81 goals for the club.
"Arsenal will always be my home," Nobbs said in an open letter to fans. "Arsenal will always be my family."
Nobbs said that "every single time I put on that shirt, I gave so much of my life to it because I knew how important it was to play for this club."
It's something really special to know that I've helped create that legacy.
Nobbs has played for England 69 times and has scored 8 goals.
She was named the FA Player of the Year in 2016 and the FA Players' Player of the Year in the same year.
She forged a deep connection with our loyal supporters and wrote her name into the history books of the club.
She is a member of the family and we would like to wish her health, happiness and success in the future.
Nobbs' new manager is excited about the international joining her squad.
Jordan is one of the country's most decorated football players, and he has signed for us.
She's a winner and will bring a lot of experience to the team.