This article examines a specific kind of sacrifice to the pagan Lithuanian and Prussian gods recorded in the written sources of the 16th and 17th centuries, sacrifices made in and by water. There is a total of just ten such records known. Both Lithuanian and Prussian tribes practiced this kind of sacrifice. It is noteworthy that sacrifices involving water were not made to a single deity, but rather to several different gods; that the kind of sacrifice varied and that the most diverse sorts of intentions were pursued in making the sacrifice.