Route 99, also known as the Woonsocket Industrial Highway, is a numbered state highway running 2.9 miles (4.7 km) in Providence County, Rhode Island, United States. The route is a nominally north–south limited-access freeway for its entire length. Route 99 serves Manville and the Highland Industrial Park, providing freeway access to the city of Woonsocket from Rhode Island Route 146, which bypasses the city. The southern terminus of Route 99 is at a partial interchange with Route 146 in Lincoln. The freeway has one unnumbered interchange in Manville, a village in Lincoln, before terminating at an at-grade intersection with Route 122 in Woonsocket.

Originally conceived as a freeway linking Route 146 and Interstate 295 with Interstate 495 in Bellingham, Massachusetts, Route 99 was constructed primarily to provide freeway access to Woonsocket and the developing Highland Industrial Park. Although originally proposed to serve Downtown Woonsocket, an alternate routing that terminated at Route 122 and ran closer to the Woonsocket–Cumberland border was later constructed by the Rhode Island Department of Transportation (RIDOT). The four-lane freeway began construction in 1987 and was completed in 1993. RIDOT has long-range plans to extend Route 99 north to Route 114 in Downtown Woonsocket, but plans for a northerly extension to I-495 have been abandoned.

Recently selected: U.S. Route 5 in Connecticut • Interstate 37 • Ridge Route