No, deli paper is not recommended for use in microwaves as it can catch fire or melt due to its flammable nature. It also may contain chemicals that are not intended for use in heating food and can potentially contaminate the food.
It is best to avoid using deli paper in any appliance that generates heat, including microwaves.  If you need to cover your food while microwaving, consider alternatives like a microwave-safe lid or parchment paper.