Peel and devein the shrimp, leaving the tails on if desired.
Pour the buttermilk into a bowl.
In a shallow dish or baking dish, combine the flour and Old Bay Seasoning.
Working in batches, dip the shrimp in the buttermilk. Shake off excess then dredge in the flour mixture, coating well. Shake off the excess. Fry 2-3 minutes or until golden brown, removing to a paper towel-lined plate or wire rack to drain while cooking the remaining shrimp.