9522 | u-album Guenée, Iodopepla, [Ceramica] | 932287 | |
8936 | u-aureum Guenée, Syngrapha, [Plusia] | 931217 | |
| u-brevis Guenée, Autographa, [Plusia] | 931200 | |
| u-notata Strand, Trichoplusia | 931168 | |
| uclueleti Barnes & Benjamin, Diarsia, [Triphaena] | 933530 | |
| Ufeina Crumb | 932708 | |
| Ufeus Grote | 932708 | |
| uintara Smith, Pseudobryomima, [Antitype], form | 932731 | |
8789 | ulalume Strecker, Catocala | 930779 | |
| ulamora Smith, Tricholita | 933198 | |
10384 | uliginosa Smith, Lacinipolia, [Mamestra] | 933032 | |
| ulmi Harris, Lochmaeus, [Notodonta] | 930091 | |
| ulmi Harris, Acronicta, [Acronycta] | 931453 | |
| Ulolonche Smith | 933117 | |
| Ulosyneda Smith | 930863 | |
| ulricusalis Walker, Bleptina | 930526 | |
11127 | ultima Strecker, Schinia, [Heliothis] | 932128 | |
| ultra Barnes & Benjamin, Anarta, [Scotogramma] | 932832 | |
8857 | ultronia Hübner, Catocala, [Eunetis] | 930841 | |
| umbella Barnes & Benjamin, Catocala | 930816 | |
| umbonata Smith, Gabara, [Eucalyptra] | 930644 | |
| umbra of authors, Pyrrhia, not Hufnagel, 1766 | 932040 | |
| umbra Barnes & Benjamin, Catocala | 930817 | |
| umbrago Esper, Pyrrhia | 932040 | |
8453 | umbralis Smith, Hypena, [Bomolocha] | 930576 | |
| umbrata Packard, Clemensia– ssp. | 930215 | |
| umbrata Schaus, Anomis | 930606 | |
7990 | umbrata Walker, Heterocampa | 930082 | |
| umbrata Walker, Heterocampa– ssp. | 930082 | |
| umbrata Walker, Lesmone, [Zethes] | 930974 | |
10194.1 | umbratica Linnaeus, Cucullia, [Phalaena] | 931515 | |
| umbratilis Dognin, Hypena | 930583 | |
| umbratus Packard, Rhyacia, [Agrotis] | 933548 | |
| umbria Dyar, Azenia, [Metoponia] | 931725 | |
9643.1 | umbricata Mustelin, Protoperigea | 932252 | |
| umbrifacta Hampson, Apamea, [Trachea] | 932317 | |
10122 | umbrifascia Smith, Sympistis, [Oncocnemis] | 931802 | |
| umbrifascia Grote, Ledaea, [Spargaloma] | 930560 | |
| umbrifasciata Blackmore, Litholomia– ssp. | 932530 | |
8677 | umbrina Grote, Zaleops, [Pheocyma] | 931004 | |
| umbripennis Grote, Zale, [Ypsia] | 931030 | |
| umbrosa Fabricius, Helicoverpa, gender-conform | 932045 | |
| umbrosa Dyar, Diarsia, [Noctua] | 933534 | |
| umbrosa Butler, Lymantria, [Porthetria] | 930141 | |
8801.1 | umbrosa Brou, Catocala | 930793 | |
10379 | umbrosa Smith, Lacinipolia, [Scotogramma] | 933027 | |
| umbrosus Grote, Helicoverpa, [Heliothis] | 932045 | |
| una Strecker, Mesapamea, [Hadena] | 932370 | |
9362.2 | unanimis Hübner, Apamea, [Noctua] | 932308 | |
| Unca Lhomme | 931160 | |
| Unciella Troubridge | 931621 | |
| uncina Hübner, Gonodonta | 930613 | |
| underwoodi Rothschild, Halysidota, excluded | 990026 | |
| undulalis Stephens, Idia, [Camptylochila] | 930471 | |
8695 | undularis Drury, Zale, [Phalaena] | 931030 | |
| undulifera Walker, Azeta, [Chabora] | 931078 | |
| undulifera Walker, Homophoberia, [Miana] | 932025 | |
| undulifera Butler, Amyna | 931253 | |
9846 | ungulatus Benjamin, Policocnemis, [Poliocnemis] | 931608 | |
8541 | unica Neumögen, Gonodonta | 930618 | |
10837 | unica McDunnough, Euxoa | 933457 | |
10926.2 | unicava Lafontaine, Spaelotis | 933556 | |
9399 | unicincta Smith, Eremobina, [Hadena] | 932373 | |
| unicolor Grote, Ufeus | 932710 | |
| unicolor Walter, Heliocheilus, [Pseudacontia] | 932059 | |
| unicolor Walker, Spaelotis, [Mamestra] | 933554 | |
7974 | unicolor Packard, Misogada, [Lochmaeus] | 930066 | |
| unicolor Wnukowsky, Lymantria | 930141 | |
| unicolor Lambillion, Lymantria | 930141 | |
8007 | unicornis Smith, Schizura, [Phalaena] | 930100 | |
| unicornis Smith, Schizura– ssp., [Phalaena] | 930100 | |
9743 | unicum Barnes & Benjamin, Cuahtemoca, [Stibadium] | 931664 | |
| unifascia Schultz, Lymantria | 930141 | |
8060 | unifascia Grote & Robinson, Cisthene | 930177 | |
| unifasciata Ménétriés, Xestia, [Amphidasis] | 933618 | |
| uniforma Hawks, Catocala– ssp. | 930825 | |
| uniformis Morrison, Zale, [Homoptera] | 931025 | |
| uniformis Smith, Homorthodes– ssp., [Taeniocampa] | 933088 | |
8046 | uniformis Dyar, Crambidia | 930220 | |
10346 | uniformis Smith, Lasionycta, [Scotogramma] | 932999 | |
| uniformis Smith, Lasionycta– ssp., [Scotogramma] | 932999 | |
8093 | uniformis Schaus, Haematomis | 930211 | |
| uniformis Strand, Abagrotis | 933680 | |
8805 | unijuga Walker, Catocala | 930797 | |
| unilineata Chermock & Chermock, Euparthenos, form | 931055 | |
8716 | unilineata Grote, Zale, [Homoptera] | 931052 | |
| unimacula Morrison, Graphiphora, [Agrotis] | 933563 | |
| unimacula Staudinger, Ochropleura | 933529 | |
11188 | unimacula Smith, Schinia | 932168 | |
9509 | unimoda Smith, Papaipema, [Hydroecia] | 932465 | |
9916 | unimoda Lintner, Lithophane, [Xylina] | 932582 | |
| unimoda Lintner, Lithophane– ssp., [Xylina] | 932582 | |
| unimoda of authors, Papaipema, not Smith, 1894 | 932506 | |
9299 | unio Hübner, Eudryas, [Euthisanotia] | 931964 | |
| Uniptena Nye | 931305 | |
10438 | unipuncta Haworth, Mythimna, [Noctua] | 932935 | |
| unipunctata Möschler, Bagisara, [Acontia] | 931240 | |
| unisignata Walker, Elaphria, [Laphygma] | 932226 | |
9355 | unita Smith, Apamea, [Xylophasia] | 932312 | |
| Unka Oken, suppressed | 931160 | |
| unocula Freyer, Tarache, [Acontia] | 931343 | |
| ura Smith, Euxoa | 933473 | |
| uramina Smith, Euxoa | 933473 | |
8881 | urentis Guenée, Abrostola | 931162 | |
| Urocoma Herrich-Schäffer | 930170 | |
10966.1 | ursae McDunnough, Xestia, [Anomogyna] | 933601 | |
| Ursia Barnes & McDunnough | 930094 | |
| ursina Smith, Acronicta, [Merolonche] | 931489 | |
8186.2 | ursina Schmidt, Grammia | 930257 | |
10625 | ursina Smith, Engelhardtia, [Lathosea] | 933191 | |
| ursini Smith, Acronicta, misspelled | 931489 | |
| Ursogastra Smith | 933169 | |
10461 | ursula Forbes, Leucania, [Cirphis] | 932965 | |
10261 | uscripta Smith, Sideridis, [Mamestra] | 932904 | |
| ussurica Kononenko, Xestia | 933596 | |
| ustipennis Walker, Schizura, [Heterocampa] | 930098 | |
10814 | ustulata Lafontaine, Euxoa | 933358 | |
| utahensis Smith, Protorthodes, [Taeniocampa] | 933105 | |
| utahensis Edwards, Arctia– ssp., [Euprepia] | 930290 | |
| utahensis Cassino, Catocala | 930817 | |
| utahensis McDunnough, Pseudopanthea– ssp. | 931402 | |
10146 | utahensis Barnes & Benjamin, Sympistis, [Oncocnemis] | 931856 | |
| ute Peacock & Wagner, Catocala– ssp. | 930820 | |
| Utetheisa Hübner | 930347 | |
| Utidava Walker | 930170 | |
| Uxia Walker | 930214 | |
| uxor Guenée, Catocala | 930792 | |