| artist,genre,country | |
| U I BLUE,Prog Folk,United States | |
| U SCO,Psychedelic/Space Rock,United States | |
| U TOTEM,RIO/Avant-Prog,United States | |
| U-NI,Psychedelic/Space Rock,Japan | |
| U.C.,Crossover Prog,Canada | |
| U.S. MAPLE,RIO/Avant-Prog,United States | |
| UARAL,Experimental/Post Metal,Chile | |
| UBERBAND,RIO/Avant-Prog,United States | |
| ÜBERFALL,Jazz Rock/Fusion,Switzerland | |
| UBERMODO,Psychedelic/Space Rock,United Kingdom | |
| UBI MAIOR,Rock Progressivo Italiano,Italy | |
| UBOA,Experimental/Post Metal,Australia | |
| UC PROJECT,Psychedelic/Space Rock,Poland | |
| UCHIHASHI KAZUHISA & MANI NEUMEIER,Krautrock,Multi-National | |
| UDDER MILK DECAY,Progressive Electronic,United Kingdom | |
| UDRAYA,Prog Folk,France | |
| UDUS,RIO/Avant-Prog,Italy | |
| UEBERSCHAER,Neo-Prog,Germany | |
| HIROM EHARA,Jazz Rock/Fusion,Japan | |
| UFAJR,Post Rock/Math rock,Czech Republic | |
| UFO ÖVER LAPPLAND,Psychedelic/Space Rock,Sweden | |
| UFOMAMMUT,Experimental/Post Metal,Italy | |
| MATTE GGERI,Progressive Electronic,Italy | |
| UI,Post Rock/Math rock,United States | |
| HA IL,Crossover Prog,Netherlands | |
| UK,Eclectic Prog,United Kingdom | |
| UKANDANZ,RIO/Avant-Prog,France | |
| ULAN BATOR,Post Rock/Math rock,France | |
| ULCERATE,Tech/Extreme Prog Metal,New Zealand | |
| ULENSPIEGEL,Krautrock,Germany | |
| ULLS,Psychedelic/Space Rock,Spain | |
| JAMES BLOO LMER,Jazz Rock/Fusion,United States | |
| ULSECT,Tech/Extreme Prog Metal,Netherlands | |
| ULTIMA SPIAGGIA,Rock Progressivo Italiano,Italy | |
| ULTIMATE SPINACH,Psychedelic/Space Rock,United States | |
| ULTIME ATOME,Neo-Prog,France | |
| ULTRA VIOLET RAYS,Neo-Prog,United States | |
| ULTRA ZOOK,RIO/Avant-Prog,France | |
| ULTRALYD,Krautrock,Norway | |
| ULTRANOVA,Crossover Prog,Brazil | |
| ULTRAPHAUNA,Eclectic Prog,Multi-National | |
| ULTRAVIOLET DAYDREAM,Neo-Prog,United States | |
| ULTRAVIOLET HIPPOPOTAMUS,Crossover Prog,United States | |
| ULVER,Post Rock/Math rock,Norway | |
| ULYSSES,Progressive Metal,Netherlands | |
| UMĆ,Crossover Prog,Multi-National | |
| UMBERTO,Progressive Electronic,United States | |
| UMEZU KAZUTOKI KIKI BAND,Jazz Rock/Fusion,Japan | |
| ÜMIT!,Psychedelic/Space Rock,Germany | |
| UMLÄUT,Eclectic Prog,Australia | |
| UMPFEL,Progressive Metal,Norway | |
| UMPHREY'S MCGEE,Crossover Prog,United States | |
| UNA CORDA,Experimental/Post Metal,United Kingdom | |
| UNA VOLTA ERAVAMO IN SETTE,Rock Progressivo Italiano,Italy | |
| UNAKA PRONG,Crossover Prog,United States | |
| UNATTA,Progressive Electronic,United States | |
| UNBELTIPO,RIO/Avant-Prog,Japan | |
| UNBROKEN SPIRIT,Heavy Prog,United Kingdom | |
| UNCLE DIRTYTOES,Prog Folk,United States | |
| UNCOLORED WISHES,Progressive Metal,France | |
| UNCONSCIOUS MOTIFS,Post Rock/Math rock,Italy | |
| UNCROSSED,Tech/Extreme Prog Metal,Russia | |
| UNDEFINED,Tech/Extreme Prog Metal,Spain | |
| UNDEFY,Crossover Prog,Poland | |
| UNDER BYEN,RIO/Avant-Prog,Denmark | |
| UNDER LANGUID LIGHTS,Post Rock/Math rock,Germany | |
| ÜNDER LINDEN,Symphonic Prog,Argentina | |
| UNDER THE BIG TREE,Jazz Rock/Fusion,United States | |
| UNDER THE SUN,Progressive Metal,United States | |
| TH NDERGROUND RAILROAD,Eclectic Prog,United States | |
| TH NDERGROUND SET,Heavy Prog,Italy | |
| UNDERGROUND ZERO,Psychedelic/Space Rock,United Kingdom | |
| UNDERTAKERS CIRCUS,Jazz Rock/Fusion,Norway | |
| UNEVEN STRUCTURE,Tech/Extreme Prog Metal,France | |
| UNEXPECT,Experimental/Post Metal,Canada | |
| UNEXPECTED ALLIES,Progressive Metal,United States | |
| UNGAVA,Prog Folk,Canada | |
| UNHOLD,Experimental/Post Metal,Switzerland | |
| UNI SONO,Jazz Rock/Fusion,Finland | |
| UNICORN,Neo-Prog,Sweden | |
| UNICORN PORN,Psychedelic/Space Rock,United States | |
| JOHNN NICORN,Crossover Prog,United States | |
| UNIFAUN,Symphonic Prog,Sweden | |
| UNIFIED PAST,Progressive Metal,United States | |
| UNIMOTHER 27,Psychedelic/Space Rock,Italy | |
| UNISPHERE,Neo-Prog,Canada | |
| UNIT WAIL,Zeuhl,France | |
| UNITED BIBLE STUDIES,Prog Folk,Ireland | |
| TH NITED JAZZ + ROCK ENSEMBLE,Jazz Rock/Fusion,Multi-National | |
| UNITED PROGRESSIVE FRATERNITY,Crossover Prog,Australia | |
| TH NITED STATES OF AMERICA,Proto-Prog,United States | |
| UNITOPIA,Crossover Prog,Australia | |
| UNIVERIA ZEKT,Zeuhl,France | |
| UNIVERS ZERO,RIO/Avant-Prog,Belgium | |
| UNIVERSAL TOTEM ORCHESTRA,Zeuhl,Italy | |
| TH NIVERSE BY EAR,Heavy Prog,Switzerland | |
| TH NIVERSE DIVIDE,Tech/Extreme Prog Metal,United States | |
| UNIVERSE EFFECTS,Progressive Metal,Canada | |
| UNIVERSE217,Experimental/Post Metal,Greece | |
| UNIVERSITY OF ERRORS,Psychedelic/Space Rock,United States | |
| UNIVERSO ROJO,Psychedelic/Space Rock,Chile | |
| UNKH,Crossover Prog,Netherlands | |
| UNLEARN,Post Rock/Math rock,United States | |
| UNMOORED,Tech/Extreme Prog Metal,Sweden | |
| UNO,Rock Progressivo Italiano,Italy | |
| UNOMA,Jazz Rock/Fusion,Spain | |
| UNREAL CITY,Rock Progressivo Italiano,Italy | |
| UNREAL OVERFLOWS,Tech/Extreme Prog Metal,Spain | |
| UNREST WORK & PLAY,RIO/Avant-Prog,United Kingdom | |
| STEV NRUH,Prog Folk,United States | |
| UNSOUL,Experimental/Post Metal,Germany | |
| UNTIL RAIN,Progressive Metal,Greece | |
| UNTIL SUNRISE,Post Rock/Math rock,United States | |
| UNTO US,Crossover Prog,United Kingdom | |
| UNTU,Experimental/Post Metal,United States | |
| UNWED SAILOR,Post Rock/Math rock,United States | |
| UNWISE,Progressive Metal,Italy | |
| UNWRITTEN PAGES,Progressive Metal,Netherlands | |
| UNZEN PILOT,Psychedelic/Space Rock,Portugal | |
| L OVO DI COLOMBO,Rock Progressivo Italiano,Italy | |
| UP THERE: THE CLOUDS,Post Rock/Math rock,Italy | |
| UPCDOWNC,Post Rock/Math rock,United Kingdom | |
| UPHILL WORK,Crossover Prog,Russia | |
| UPPSALA,Zeuhl,France | |
| UPRIGHT,Jazz Rock/Fusion,Canada | |
| UPRISING FORMALHAUT,Experimental/Post Metal,Ukraine | |
| UPSILON ACRUX,RIO/Avant-Prog,United States | |
| UQBAR,Prog Folk,Argentina | |
| UR,Krautrock,Norway | |
| UR DRAUGR,Tech/Extreme Prog Metal,Australia | |
| UR KAOS,RIO/Avant-Prog,Sweden | |
| URANIAN,Heavy Prog,Argentina | |
| URBAN NOMAD,Eclectic Prog,Canada | |
| URBAN TRAPEZE,Symphonic Prog,Spain | |
| TH RBANE,Crossover Prog,United Kingdom | |
| MICHA RBANIAK,Jazz Rock/Fusion,Poland | |
| URDOG,Psychedelic/Space Rock,United States | |
| URIAH HEEP,Heavy Prog,United Kingdom | |
| URNA,Progressive Electronic,Italy | |
| URNA,Experimental/Post Metal,Italy | |
| URSA,Post Rock/Math rock,Spain | |
| DEZ RSINY,Crossover Prog,Slovakia | |
| TH RSULA MINOR,Psychedelic/Space Rock,Tunisia | |
| URTHONA,Post Rock/Math rock,Japan | |
| US,Neo-Prog,Netherlands | |
| US AND THEM,Prog Folk,Sweden | |
| US ON ROOFS,Post Rock/Math rock,United States | |
| TH SA IS A MONSTER,Psychedelic/Space Rock,United States | |
| USER NE,Experimental/Post Metal,Spain | |
| UT GRET,RIO/Avant-Prog,United States | |
| UTOPIA,Progressive Metal,Italy | |
| UTOPIA,Krautrock,Germany | |
| UTOPIA,Eclectic Prog,United States | |
| UTOPIA 239,Rock Progressivo Italiano,Italy | |
| TH TOPIA STRONG,Krautrock,United Kingdom | |
| UTOPIAN FIELDS,Neo-Prog,Norway | |
| UTOPIAN TRAP,Progressive Metal,United States | |
| UTOPIANISTI,Jazz Rock/Fusion,Finland | |
| UTOPIC SPORADIC ORCHESTRA,Zeuhl,France | |
| UTTU,Crossover Prog,Finland | |
| UTU,Crossover Prog,Finland | |
| UUUU,Krautrock,United Kingdom | |
| UZ JSME DOMA,RIO/Avant-Prog,Czech Republic | |
| UZEB,Jazz Rock/Fusion,Canada | |
| UZRUJAN,Post Rock/Math rock,Croatia | |
| UZVA,Jazz Rock/Fusion,Finland | |