The Northern Ireland under-21 international had a good end to the season, winning man-of-the-match awards against Clyde and Berwick. (Click to tweet this)
And he has been rewarded for the progress he made during the 2012/13 campaign with an additional 12 months at Ibrox.
Mitchell made his debut for the Light Blues in the SPL last term against Dundee United and also featured in a 3-1 home win against St Mirren.
In both of those games he played as a right midfielder but this term he has reinvented himself as a full-back.
Delighted to sign my new deal today, its a privilege to play for this club. Love everything about it. Now looking on to the new season.— Andy Mitchell (@andymitch8) May 21, 2013
Playing both on the right and left sides of defence, Mitchell skippered the reserves under Tommy Wilson to the SFL Reserve League title.
And his good form resulted in a call into the senior side, in which he made starts in the final four Third Division fixtures of the campaign.
Manager Ally McCoist is hopeful of announcing a number of new signings in the weeks ahead as he looks to bolster his squad prior to the new season.
But having secured several youngsters on new contracts as well, he will be delighted to have added 21-year-old Mitchell to the list.
The former Manchester City trainee will now return home to Ulster ahead of a trip to Cyprus for an under-21 international next week.
Mitchell will then be back in Glasgow towards the end of June for the start of pre-season training as he moves into his fifth year with Gers.