Oyster River High School (ORHS), part of the Oyster River Cooperative School District (ORCSD), is a public high school located in Durham, New Hampshire, United States with an enrollment of about 700 students. It serves Durham and the neighboring communities of Lee and Madbury. The high school opened and the first graduating class was in 1956. Dean Sackett was the Chairman of the School Board, Arthur E. Toll was the Superintendent of Schools, John H. Day was Principal, and George W. Pasichuke was the Associate Principal. The school yearbook is named Trion, named by Margaret Campbell in a school-wide contest.