Neckertal is a municipality in Toggenburg in the canton of St. Gallen in Switzerland. It was created on January 1, 2009, when Brunnadern, St. Peterzell, and Mogelsberg joined together to become Neckertal. On 1 January 2023, the former municipalities of Hemberg and Oberhelfenschwil joined together and became a municipality called Neckertal.