Arsene Wenger's men are in town on Saturday tea-time and you could be at Old Trafford to see United and Arsenal do battle.
Betfair, the club's official betting partner, have two pairs of tickets to give away for this weekend's Barclays Premier League clash which kicks off at 17:15 BST.
To be in with a chance of winning, all you have to do is join Betfair before midday on Friday 28 August. Terms and conditions apply.
Once you've joined, you'll enjoy everything Betfair has to offer, including the excitement of Fan v Fan betting for bigger wins.