David UU (pronounced David W.), or David W. Harris, (1948–1994) was an accomplished concrete and experimental poet and an important small press publisher. Along with Bill Bissett and bpNichol, he was a pioneer of the concrete poetry movement in Canada, and perhaps the first Canadian poet to explore visual collage embodying literary, philosophical and language references. He also composed sound works (both musical & textual), made 8mm short films, was a master collagist/montagist and performed in numerous performance art exhibitions.