Marktbreit am Main is a town in the district of Kitzingen in the Regierungsbezirk Unterfranken in Bavaria, Germany. It is situated at the most southern point of the Main river. Marktbreit is the birthplace of Alois Alzheimer who first identified the symptoms of what is now known as Alzheimer's disease. With its suburb Gnodstadt, Marktbreit has around 3,700 inhabitants.