Systematic reviews, along with other types of knowledge synthesis, are a type of research methodology that attempt to find all available evidence on a topic to help answer specific questions. Librarian involvement in systematic reviews is well established in the health sciences, and in recent years there has been growing awareness of, and literature about, librarians outside of health supporting systematic reviews. This study benchmarks librarian support of systematic reviews in the sciences, humanities, and social sciences (SHSS) by looking at the growth of demand for support, the disciplines requesting this kind of librarian support, and the specific types of support needed. It also examines what SHSS librarians need to be successful in this type of work, including administrative support and workload adjustments.