Abstract: The canteen cup insulator of the present invention implements an insulating layer that can be deployed in conjunction with the standard military issue canteen and cup. The canteen cup insulator is most preferably manufactured from a durable material that has at least some insulating value. The exact nature and thickness of the insulating material may vary depending on the specific application. The canteen cup insulator may be selectively attached to and removed from the canteen cup, thereby providing insulation for the canteen cup. Additionally, the canteen cup insulator has an integral “foot” formed around the lower edge, thereby providing a wider base and additional stability for the canteen cup and liquid contents during use.