Wrapping paper is a way of making a statement when you wrap your gifts. The paper you choose says a lot about what you like, or about what the recipients of your gifts like. When it comes to fans of the Harry Potter series there is only one kind of paper that matters - Harry Potter wrapping paper!
I have to admit that I was surprised to find that there are not a lot of gift wrapping papers to choose from given how popular the boy wizard is. The good news is that there are at least a few styles to choose from, including Christmas paper and general paper that would work well for birthdays or other occasions.
In addition to paper I also found Harry Potter gift bags and tissue paper, and am including them here. That way you have two types of gift wrappings that you can use.
There are two online stores where you can buy official wrapping paper - Amazon and eBay. They are likely to have different selections so I encourage you to visit both sites to see what each one has. If you prefer custom made wrapping paper then take a look at Etsy to see their selection.