Palmyra Area Senior High School (typically referred to as Palmyra High School or PHS) is a midsized public high school located in Palmyra, Pennsylvania, in the United States. It is part of the Palmyra Area School District. The school is located at 1125 Park Drive in North Londonderry Township serves students from the western part of Lebanon County, Pennsylvania and includes: Palmyra, North Londonderry Township, South Londonderry Township, the villages of Campbelltown, Lawn and Mount Gretna.