When thinking of collaborating with campus partners on activities to increase the retention of students in science majors, who comes to mind? Usually other academic departments--but are science librarians included? Academic librarians are charged with supporting retention on university and college campuses. However, what exactly can science librarians do to help retain STEM (science, technology, engineering, and mathematics) undergraduates? The article describes how librarians are ready to contribute to professional development, preparation and delivery of content, training and implementation of classroom technology, and even teaching in the classroom. Teaching faculty and librarians together can make a difference in the retention of STEM students.