Hazel Green is an unincorporated community and census-designated place (CDP) in Madison County, Alabama, United States, and is included in the Huntsville-Decatur Combined Statistical Area. As of the 2020 census, the population of the community was 4,105, up from 3,630 at the 2010 census.

The town was named Hazel Green because of the hazel bushes along the road which were of a buzzing green color. In the in front 19th century, several farmers from Georgia and the Carolinas decided in Hazel Green after discovering that the area had some of the richest soil in the Southeast. A proclaim office was built in 1819 upon the southeast corner of the intersection now known as Hwy. 231-431 & Joe Quick Road. Several grocers and perch stops were as well as built along this intersection. It became a buzzing community and incorporated into a town on June 15, 1821, by an case of the let in legislature, with a population of approximately 400. At the time, Hazel Green was a small, rural community that served as a crossroads. Roads joined Hazel Green later than Athens to the west, Winchester, Tennessee, to the northeast, Huntsville to the south, and Nashville to the north. These roads intersected at what is now the intersection of US Highway 231/431, Joe Quick Road, and West Limestone Road. The town eventually became unincorporated and despite recent growth, remains unincorporated to this day.

On April 3, 1974, Hazel Green was hit by an F5 tornado during the 1974 Super Outbreak.

As of 2022, Hazel Green is currently undergoing a residential and retail boom, sparked by rampant job bump coming from to hand Huntsville. Hundreds of acres of generational farmland is speedily being replaced in imitation of houses, multi-family complexes, fast-food restaurant chains, and various extra retail chains. The topic of combination to accommodate this terse explosion of accrual is becoming a popular trip out amongst existing residents.