River Dell High School is a four-year comprehensive regional public high school, part of the River Dell Regional School District, which is shared with the neighboring communities of Oradell and River Edge in Bergen County, New Jersey, United States. Located in Oradell, River Dell High School has been a four-year high school since 1994, and is accredited by the New Jersey Department of Education and the Middle States Association of Colleges and Secondary Schools.As of the 2014-15 school year, the school had an enrollment of 1,067 students and 87.9 classroom teachers (on an FTE basis), for a student–teacher ratio of 12.1:1. There were 9 students (0.8% of enrollment) eligible for free lunch and 4 (0.4% of students) eligible for reduced-cost lunch.Awards, recognition and rankingsDuring the 1997–98 school year, River Dell High School was recognized with the National Blue Ribbon School Award of Excellence by the United States Department of Education, the highest award an American school can receive.