The use of research models in driving scholarly investigation is of great importance in any field, including information systems (IS). As such, a taxonomy of IS research models should be of substantial value to the discipline. Such a taxonomy is developed in this article based on the IS research literature. Eleven model types are examined in detail in order to investigate how they are used by researchers, in articles published in seven leading IS journals during a recent six year period. Interesting results emerge in the use of models overall, as well as trends over time and relationships with specific methodologies and IS journals. Multi-tier influence diagram is the most used research model in IS research, while the no model, listing of variables, mathematical model, and simple influence diagram also find significant usage among the IS research community. Patterns of model use were also identified based on top journals and prevalent research methodologies.