Students in graduate theological programs working toward ordination and a career in ministry in the Christian church require library collections that support their study of scripture, doctrine, ancient languages, and Biblical history and interpretation, as well as the practice of pastoral ministry, leadership,and administration. This chapter will discuss how to build collections at theological libraries measured against standards set by the Association of Theological Schools, the accrediting organization for theological schools in Canada and the United States; the importance of print and online reference works such as language dictionaries, atlases, and encyclopedias in theological library collections; indexes and databases for theological studies; important journals; the different categories of theological monographs; collection development policies; special collections in theological libraries; dealing with gifts and donors; and professional development resources for theological librarians.