| 33620 | Uranium-plutonium alloys | |
| 13000 | Uranophane | |
| 13000 | Uranothorianite | |
| 33610 | Uranyl nitrate containing natural uranium | |
| 33630 | Uranyl nitrate containing uranium depleted in U 235 | |
| 33620 | Uranyl nitrate containing uranium enriched in U 235 | |
| 33620 | Uranyl oxide containing uranium enriched in U 235 | |
| 33610 | Uranyl sulphate containing natural uranium | |
| 33630 | Uranyl sulphate containing uranium depleted in U 235 | |
| 33620 | Uranyl sulphate containing uranium enriched in U 235 | |
| 64114 | Urban airport limousine services | |
| 64111 | Urban and suburban railway transport services of passengers | |
| 64112 | Urban and suburban scheduled road transport services of passengers | |
| 64114 | Urban and suburban special-purpose scheduled road transport services of passengers | |
| 83221 | Urban development programmes, assessment of | |
| 83221 | Urban development programmes, environmental impact studies of | |
| 83221 | Urban development, undertaking feasibility studies of | |
| 64113 | Urban passenger transport services, using more than one mode of transport | |
| 64111 | Urban passenger transportation by railway | |
| 83221 | Urban planning services | |
| 64114 | Urban special-purpose passenger transportation, scheduled | |
| 88422 | Urea manufacturing services | |
| 34611 | Urea, whether or not pure and whether or not in aqueous solution | |
| 34170 | Urease | |
| 34150 | Ureides and their salts and derivatives (excl. open chain ureides and heterocyclic ureides) | |
| 35220 | Ureides, open chain, and their derivatives, and salts thereof | |
| 34150 | Ureines and their salts and derivatives | |
| 37195 | Ureometers | |
| 35220 | Urethan | |
| 48150 | Urethroscopes | |
| 48150 | Urethrotomes | |
| 37210 | Urinals (plumbing fixtures), ceramic (excl. of porcelain or china; excl. portable) | |
| 37210 | Urinals (plumbing fixtures), ceramic, of porcelain or china (excl. portable) | |
| 37221 | Urinals, portable, of ceramics other than porcelain or china | |
| 37195 | Urinals, portable, of glass | |
| 36940 | Urinals, portable, of plastics | |
| 37221 | Urinals, portable, of porcelain or china | |
| 42911 | Urinals, portable, of stainless steel | |
| 48253 | Urine-testing instruments and appliances, laboratory-type (excl. urinometers) | |
| 48251 | Urinometers | |