To duplicate objects in Pygame, you can create a new instance of the object and copy over its attributes. For example, if you have a Player class with attributes such as position, speed, and health, you can create a new player object by calling the Player constructor and passing in the original player's attributes as arguments. Alternatively, you can use the copy.deepcopy() function to create a deep copy of the object, which will create a new instance with all of its attributes copied over.