Field School can mean:
Field school, mentored field research Farmer field school, an international farm-education program Field school (Israel), field schools in Israel
It can also refer to schools with the name "Field" in them:
The Field School, a college-preparatory school in Washington, D.C., United States Field High School, a public high school near Mogadore, Ohio, United States Field Elementary School in Field, British Columbia, Canada Field Elementary School (Massachusetts), an elementary school in Weston, Massachusetts, United States