Recent research has turned from general studies of the role of the Old Testament in Paul's theology to consideration of Paul's engagement with individual biblical books. While much of the interest has so far centered on Isaiah, attention is increasingly paid to Deuteronomy. This article surveys current trends in approaches to Deuteronomy in Paul's letters, focusing especially on three types of studies: textual and methodological studies of Paul's citation technique and Vorlage, considerations of Deuteronomy in Paul's theology, and investigations of the role of Deuteronomy in the formation of Paul's ethics. After surveying the major recent contributions, several areas for further research are suggested.