Martin Luther's and Huldrych Zwingli's views on the use of paintings in a worship context differ markedly, despite partial similarities. Taking into account the ideological and political background of the Wittenberg and Zurich Reformations, this study traces the connection between the two reformers' attitudes towards images and their theological emphases, noting also the role of the commandment "Thou shalt not make unto thee any graven image" as an argument for Zwingli's critique of images and Luther's critique of iconoclasm.