Ollie's Bargain Outlet is an American chain of discount closeout retailers. It was founded in Mechanicsburg, Pennsylvania in 1982 by Morton Bernstein and Mark L. Butler with backing from Harry Coverman and Oliver E. "Ollie" Rosenberg; the latter of whom is the namesake of the company. As of February 2023, the chain has 468 locations in 29 states. Its selection of merchandise comprises a variety of discounted household goods, apparel, pet supplies, kitchen pantry staples, and seasonal products (holiday, gardening, patio, pool and beach supplies); a majority of these items are unsold or overstocked merchandise that is purchased in bulk from other retailers and sold at discounted prices.

Ollie's stores feature its namesake co-founder Ollie Rosenberg, in the form of humorous caricatures throughout its stores' interiors, merchandising displays and on its logo and exterior signage. Rosenberg, a capital area realtor and entrepreneur, died in 1996 at age 75.