In a large skillet over medium heat, crumble sausage. Add onion and celery and cook, stirring occasionally until sausage is brown.
Place cubed stuffing in a large bowl and add sausage mixture. Sprinkle with poultry seasoning. Pour broth and butter over the top and toss to combine. Season with salt and pepper if needed.
Spoon stuffing into a 9x13 inch baking dish, cover and bake for 45 minutes.