Gillett is a city in Oconto County, Wisconsin, United States. The population was 1,256 according to the 2000 census. It is part of the Green Bay Metropolitan Statistical Area. The city is located within the Town of Gillett.
According to the United States Census Bureau, the city has a total area of 1.4 square miles (3.5 km2), of which, 1.4 square miles (3.5 km2) of it is land and 0.73% is water.
At the 2000 census, there were 1,256 people, 515 households and 329 families residing in the city. The population density was 923.9 per square mile (356.6/km2). There were 546 housing units at an average density of 401.6 per square mile (155.0/km2). The racial makeup of the city was 96.58% White, 0.40% Black or African American, 1.19% Native American, 1.04% from other races, and 0.80% from two or more races. 0.88% of the population were Hispanic or Latino of any race.