Def, Dumb & Blonde is the third solo album by the American singer Deborah Harry. Released in October 1989 on Sire Records in the US and Chrysalis Records in the UK, the album saw Harry reverting from "Debbie" to "Deborah" as her professional name. Harry worked with a variety of producers on the album, including Mike Chapman who had previously produced the last four Blondie albums. "I wanted," she remarked, "to do certain things that were reminiscent of Blondie." In late 1989, Harry toured for the first time as a solo artist extensively in Europe and the United States to support the album.