Hempfest may refer to:

• Emerald Empire Hempfest, held annually in Eugene, Oregon, since 2003
• Great Midwest Marijuana Harvest Festival, also called Harvestfest, or Hempfest, held annually in Madison since 1971
• Missoula Hempfest, held annually since 1996
• Moscow Hemp Fest, Idaho event held annually since 1996
• Olympia Hempfest, held annually since 2004
• Salem Hempfest, held annually since 2015
• Seattle Hempfest, held annually since 1991