Back Matter is a gallery space within the book arts-focused 23 Sandy Gallery in Portland, Oregon.

The back matter of a book can serve many purposes: it can continue the narrative of the main text, provide supplementary information, or comment on the historical and cultural impact of the book.

Inspired by the definition of back matter, this gallery-within-a-gallery is a space to explore the many methods book artists may employ in the creation of their work—from the concepts that inspire and inform the art to the many techniques of designing and combining text and image. Curated by Erin Mickelson.