Question about working with a load bearing wall in a residence.?

In a couple of places in my house I have made some small display shelves by finding a studspace(in a NON load bearing wall) and cutting the drywall out between the studs 2 to 3 feet high then making a wooden display shelf to slide in between the studs then trimming the shelf out and it makes use of otherwise wasted space. My question is, I would like to put just one shelf in the hallway but the wall I want to put it on is a load bearing wall. Can I still do this so long as I don't cut any wall studs, just the drywall?