St.-Pius-Gymnasium is a catholic private highschool in Coesfeld near Münster in Germany. It is held by the diocese of Münster and named after Pope Pius X. . Until 1976 the school was a boarding school only for boys. Since then it has been a Gymnasium. Today, there are 791 pupils.
In Advent, the school publishes a yearbook named "Piusbrief". Its pupil magazine "Fünf vor Acht" got multiple honours.
The whole school is a non-smoking area.