The Seattle Art Museum’s Historic Media Collection (HMC) is a collection of over 3,000 digitized audiovisual materials related to the museum’s educational programs and exhibitions. Our project’s goal was to develop an initial set of subject headings for these materials. We focused this initial set on Indigenous Art because Indigenous peoples’ identities are historically underrepresented or inaccurately described in controlled vocabularies. To accompany the list, we developed a framework and guide for the museum to use in creating inclusive and representative subject descriptors for other art areas and as part of the museum’s commitment to diversity, equity, and inclusion.