Henrys Fork is a tributary river of the Snake River, approximately long, in southeastern Idaho in the United States. It is also referred to as the North Fork of the Snake River. Its drainage basin is , including its main tributary, the Teton River. Its mean annual discharge, as measured at river mile 9.2 (Henrys Fork near Rexburg) by the United States Geological Survey (USGS), is , with a maximum daily recorded flow of , and a minimum of .