In this CRLT Occasional Paper, we describe specific classroom strategies and teaching behaviors that have been demonstrated to improve the success of a diverse body of students in STEM (science, technology, engineering, and mathematics) courses. We also provide practical advice to individual faculty members who are seeking to implement these teaching strategies. Extensive research on why students leave STEM fields suggests that individual faculty can play a key role in supporting and retaining a diverse student body in STEM. Although underrepresented groups may have the most to gain, retention-conscious teaching practices are likely to have a positive impact on the persistence of all students in STEM.