O Bar is a martini bar and lounge located in downtown Fairfield. The atmosphere is trendy, with a long bar and low, black leather couches. The bar specializes in wine and martinis, like the White Chocolate martini. A menu of bar and finger food is available, including burgers and more gourmet options like Blue Point oysters on the half shell, pizzas topped bleu cheese and a pear and balsamic reduction, and Profiteroles au Chocolat. A private room is available for parties of 50 or less. Happy hour is held Monday through Friday from 4pm to 7pm.