Greenfield High School is a public high school in Greenfield, Wisconsin, United States. It serves grades 9-12 for the Greenfield School District.

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Construction began on the original Greenfield High School on December 16, 1957, shortly after the City of Greenfield was incorporated. The 47-acre site on the corner of Layton Avenue and South 60th Street was purchased for $65,000. Though construction continued, it opened for the first day of school September 12, 1958 with an assembly in the unfinished cafeteria. The school was officially dedicated on June 14, 1959.

In 2010, a new high school was built at a cost of $41 million. The school includes a school store, a remodeled cafeteria, and a fitness center. An academic wing was built to replace the wing from the original school. In addition, a new gymnasium was built to supplement the existing "Hawk Dome". The natatorium had its ribbon cutting on January 8, 2010. Athletic facilities include a track, tennis courts, and baseball, soccer, and football fields.

Greenfield is accredited by Cognia.

Greenfield's Hustlin' Hawks are members of the Woodland Conference. School colors are forest green and Vegas gold. The following Wisconsin Interscholastic Athletic Association (WIAA) sports are offered:

• Matt Turk, National Football League (NFL) punter
• Dan Nimmer, Pianist for Wynton Marsalis

• Official website