The answer to the question will entirely depend on the matress’ and the tent’s dimensions. Usually, a standard queen-sized air mattress measures around 60 inches (152 cm) wide and 80 inches (203 cm) long. If you happen to have a tent with a floor area of approximately 45-55 square feet (4.2-5.1 square meters), then a queen-sized air mattress can fit in your tent. However, you might have to compromise some space that is supposed to be allotted for storing your gear. The location of the poles and guy lines, the slope of the walls, and the shape of the tent can potentially reduce the overall space of the tent. Also, keep in mind that the presence of tapered or angled walls that is present in other three-person tents will also be a factor in making the tent have limited interior space. It is best to check the exact dimensions of the mattress and the tent to guarantee that the mattress can fit perfectly inside the three-person tent you plan to purchase. In addition, ensure to consider the tent’s size, the number of people who plan on sleeping in the tent, and the gear that you need to place inside the tent.