| Ubaldo Giacomucci | 1984 | | Italy | Mag/Lit |
| Ubaldo Giacomucci | Mail-Art Show 1983 | 1983 | Italy | Poster |
| Ubaldo Giacomucci | Postmodern Phone Art | | Italy | Mag/Lit |
| Ubaldo Giacomucci | Teenage Sex | | Italy | Mag/Lit |
| Ugo Locatelli | Fonogrammi | | Italy | Mag/Lit |
| Ulises Carrion | Contents (Remont Gallery) Polen 1976 | 1976 | Poland | Mag/Lit |
| Ulises Carrion | Mail Art and the Big Monster POSTER | 1979 | Netherlands | Poster |
| Ulises Carrion | Ulises Carrion The Poets Tongue Promoposter | | Netherlands | Mag/Lit |
| Ulli Kattenstroth | Visions of an imaginary spartakiade | | Germany | Mag/Lit |
| Ulli McCarthy | Your Face - Writers Forum / Quartro 6 | | United Kingdom | Mag/Lit |
| Un-Film | Un-Film Release Information | 1988 | United States | Mag/Lit |
| Uncommunity | Promo-Material | | | Mag/Lit |
| Unovidual | Info Sheets to Unovidual (Henk Wallays) | 1983 | Belgium | Mag/Lit |
| Urbain Autopsy | Inonu | 1988 | France | Mag/Lit |
| Uterus 28 | Instrumentations | 1987 | United Kingdom | Mag/Lit |
| Uterus 28 | Letter | 1987 | United Kingdom | Mag/Lit |
| Utilisation Du Vieux Port & La Fondation | Letter to Haufen 1983 | | France | Mag/Lit |
| Uwe Warnke | Buchstabensuppe (Entwerter Oder) 1990 | 1990 | Germany | Mag/Lit |
| Uwe Warnke | Found Poetry (Entwerter Oder) 1991 | 1991 | Germany | Mag/Lit |
| Uwe Warnke | Serielle und andere Texte (Entwerter Oder) 1989 | 1989 | Germany | Mag/Lit |
| Uwe Warnke / Valeri Scherstjanoi | Partitur A / von A bis Z | | Germany | Mag/Lit |