Purpose -This paper aims to examine the methods of diversity-related collection assessment useful for large academic libraries. Design/methodology/approach -Several examples of diversity-related collection assessment (circulation and use statistics, WorldCat Collection Analysis, comparison to standard bibliographies, focus groups, patron interviews and surveys, stewardship letters, and a diversity collection development statement) are explored. Findings -Libraries wishing to assess a collection for diversity should have a clear definition of diversity in place before assessment. Many collection assessment methods useful for determining the diversity of a collection are not applicable for large libraries. Additional tools may need to be developed to facilitate this type of assessment in the future, especially at large libraries.Originality/value -The paper encourages librarians at larger academic libraries to rethink how the collections are assessed for diversity needs, and illustrates methods useful in performing this assessment in larger institutions.