The Marburg Colloquy was a meeting at Marburg Castle, Marburg, Hesse, Germany, which attempted to solve a disputation between Martin Luther and Ulrich Zwingli over the Real Presence of Christ in the Eucharist. It took place between 1 October and 4 October 1529. The leading Protestant reformers of the time attended at the behest of Philip I of Hessen. Philip's primary motivation for this conference was political; he wished to unite the Protestant states in political alliance, and to this end, religious harmony was an important consideration.

Marburg is a university town in the German federal state of Hesse, capital of the Marburg-Biedenkopf district. The town area spreads along the valley of the river Lahn and has a population of approximately 76,000.