Gardner is a city in Worcester County, Massachusetts, United States. The population was 20,228 at the 2010 census.
Named in honor of Col. Thomas Gardner, the community was first settled in 1764 and officially incorporated as a town in 1785 after receiving land grants from the surrounding towns of Ashburnham, Westminster,Templeton and Winchendon. Dating from about 1805, it became a center for lumber and furniture industries. Gardner is known as the "Chair City" and "The Furniture Capital of New England", due to its long history in furniture production. By 1910 it had 20 chair factories which produced 4 million chairs per year. It was also noted for silversmithing. The Gardner State Colony for the Insane pioneered the use of cottage residences. Gardner was incorporated as a city in 1923.