The Willem Lodewijk Gymnasium is a Christian gymnasium (secondary school) in Groningen, Netherlands. It is the smaller of two non-comprehensive gymnasiums in Groningen, along with Praedinius Gymnasium. As of 2015, the gymnasium had approximately 710 students and 78 staff members.

On March 11,1909, a group of parents founded the school. It was named the Willem Lodewijk Gymnasium after Count William Louis of Nassau-Dillenburg.

An average of 71% of all students pass the Dutch final exams without repeating a class. The average mark for the final exams is 6.8 out of 10.

The gymnasium was originally located at 46 Oosterstraat. In 1923, it was relocated to 11 Oosterstraat as enrollment increased. In 1969, the school relocated to 220 Verzetstrijderslaan.

53°12′30″N 6°33′01″E / 53.2083°N 6.5503°E / 53.2083; 6.5503