OSA is located in Middletown, United States on 500 Main St. OSA is rated 4.7 out of 5 in the category gastropub in United States. Kevin Wirtes and Rich Garcia of Krust (Middletown), team up in the creation of their latest venture, Osa. Located at 500 Main Street in Middletown, Osa features local food, with a fresh take on New American. The full bar offers crafted cocktails, whiskey, a large wine pour list, and craft beer.