Genevan Reformer John Calvin produced a half dozen catechisms during his tenure in the city from 1536 to 1538 and 1541 to 1564. While not nearly so well-known as his Institutes of the Christian Religion or Geneva Bible, and not nearly so heavily used today as the later Reformed catechisms of Heidelberg or Westminster, Calvin’s catechisms were impressive for their biblical acuity, pristine language, and doctrinal precision and for their power to integrate the far flung Calvinist communities of the sixteenth century. This Article samples these catechisms, and analyzes their use in spiritual formation and discipline for both children and adults in Geneva.