The Penn-Delco School District is a midsized, suburban public school district in Delaware County, Pennsylvania, that encompasses the following municipalities: Aston Township, Brookhaven Borough, and Parkside Borough.

[3] Started in 1960 by Dr. William G. Moser, who served as the district's first superintendent, the district was carved out of the nearby present-day Chester-Upland School District and was instrumental for the building of the Sun Valley Senior High School and administration building on land donated by the Sun Oil Company (now Sunoco).

In addition to the regular curriculum, in 1976, the U.S. Marine Corps Jr. ROTC (MCJROTC) program was offered for the first time and was only one of three MCJROTC units in the Delaware Valley area – the others being in nearby Chester City and in Bensalem.

The Sun Valley High School Vanguards play all interscholastic games in the Ches-Mont League.

Its ice hockey team has no school sponsorship and is an independent affiliate of the ICSHL