Place the Oreo cookies in a food processor and process them into fine crumbs until you have about 2 cups of crumbs. Alternatively, add them to a sealed bag and crush with a rolling pin.
Mix the crumbs with the melted butter until well combined. Press the mixture firmly into a 9-inch pie dish, covering the bottom and rising slightly up the sides. Bake at 350°F for 8-12 minutes, then let cool completely before filling.