Naugatuck is a consolidated borough and town in New Haven County, Connecticut, United States. The town spans both sides of the Naugatuck River just south of Waterbury, and includes the communities of Union City on the east side of the river, which has its own post office, Straitsville on the southeast (along Route 63), and Millville on the west (along Rubber Avenue). As of the 2010 census, Naugatuck had a population of 31,862.

Naugatuck was settled in 1701 as a farming community in rural western Connecticut. As the Industrial Revolution commenced, Naugatuck was transformed into a hardscrabble mill town like its neighbors in the Naugatuck Valley.

Rubber was the chief manufactured product. Charles Goodyear worked at his brother's rubber company, the Goodyear Metallic Rubber Shoe Company & Downtown Naugatuck, until the company was consolidated into the United States Rubber Company. The United States Rubber Company (renamed Uniroyal Inc. in 1961) was founded in Naugatuck in 1892 as a consolidation of nine rubber companies, and maintained their corporate headquarters there until the 1980s. Their Footwear Division manufactured Keds sneakers in Naugatuck from 1917 until the 1980s. U.S. Rubber also produced Naugahyde in a Naugatuck factory, but it is no longer produced there.

Due to an increase in the price of sulfuric acid, which was needed for the process then used for reclaiming old rubber, the United States Rubber Co. formed the Naugatuck Chemical Company on June 1, 1904, and the company soon was in the forefront of the chemical industry in the United States. Naugatuck Chemical remained a subsidiary of the U.S. Rubber Co. until, under Uniroyal, it gained independence as Uniroyal Chemical Co. They moved their operations to Middlebury, Connecticut, in the 1970s.

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