| Ship Name | Ship Type | Notes |
| U Index | ||
| Uira | Schooner | Built 1853 Tonnage 26 |
| Uira | Steamer | Built **** Tonnage *** |
| Ului -I- Laheba | Schooner | Built 1876 Tonnage 24 |
| Ulva | Cutter | Built 1876 Tonnage 18 |
| Una | Scow | Built 1883 Tonnage *** |
| Una | Ketch | Built **** Tonnage 20 |
| Una | Steamer | Built 1871 Tonnage 19 |
| Uncle John | Built **** Tonnage *** | |
| Uncle Sam | Schooner | Built 1844 Tonnage 25 |
| Underwood | Built 1941 Tonnage 1,990 1944 torpedoed and sunk in English Channel by German torpedo boats. | |
| Undine | Cutter | Built **** Tonnage 22 |
| Undine | Schooner | Built 1846 Tonnage *** |
| Undine | Steamer | Built 1861 Tonnage 14 |
| Union | Brig | Built ****Tonnage 158 |
| Union | Schooner | Built 1841 Tonnage *** |
| Union Aotearoa | Built 1973 Tonnage 6,306 1973-1978 chartered from Gannel Shipping Ltd, 1978 sold to China Ocean Shipping, Shanghai, renamed Xing Cheng. | |
| Union Auckland | Built 1969 Tonnage 12,782 ex- Columbia, 1976 chartered from Wigmore Ltd, Bermuda and renamed Union Auckland, 1997 sold to Union Shipping NZ, Auckland | |
| Union Australia | Built 1972 Tonnage 3,165 1977 chartered from Deep Sea Shipping Co., Wellington. | |
| Union Dunedin | Built 1978 Tonnage 5,290 ex- Tfl Progress, 1983-1986 chartered from Gursan Investments, Piraeus and renamed Union Dunedin, 1986 off charter. | |
| Union Endeavour | Built 1982 Tonnage 13,482 ex- Dagmar Reeckmann, 1986-1991 chartered from Halstead Shipping, Monrovia and renamed Union Endeavour, 1991 off charter, renamed Penelope II. | |
| Union Hobart | Built 1976 Tonnage 4,376 1984 renamed Seaway Hobart, 1992 sold to Cyprus, renamed Seaway I. | |
| Union Lyttelton | Built 1976 Tonnage 4,376 1983 renamed Seaway Melbourne, 1992 sold to Egypt, renamed Fast Trader. | |
| Union Melbourne | Built 1975 Tonnage 4,377 1975-1980 chartered from Northern Containers Ltd, London, 1980 renamed Union Trader, 1980 off charter from Northern Containers Ltd., London, renamed Puma. | |
| Union Nelson | Built 1980 Tonnage 1,728 ex- Sunny Karina, 1981 acquired from Aquarius, Hamburg and renamed, 1991 renamed Polynesian Link. 1991 capsized and scrapped. | |
| Union New Zealand | Built 1972 Tonnage 3,165 1972-1978 chartered from Deep Sea Shipping Co., Wellington, 1975 sold to Maritime Carriers, New Zealand | |
| Union Rotoiti | Built 1977 Tonnage 12,967 1997 still in service. | |
| Union Rotoma | Built 1976 Tonnage 13,978 ex- Rost, 1991 purchased from Kagoro Ltd, Nassau and renamed, 1997 still in service. | |
| Union Rotorua | Built 1976 Tonnage 12,967 1997 still in service. | |
| Union South Pacific | RoRo ship | Built 1972 Tonnage 968 chartered from Sea Containers Chartering, London, 1978 renamed Tarros Hazel. |
| Union Sydney | Built 1972 Tonnage 4,210 ex- Leena Dan, 1974-1977 chartered from Lauritzen, Copenhagen and renamed Union Sydney, 1977 reverted to Leena Dan. | |
| Union Sydney | Built 1978 Tonnage 5,290 ex- Tfl Prosperity, 1983-1986 chartered from Norman Investments Corp., Piraeus and renamed Union Sydney, 1986 off charter, renamed Freeway North. | |
| Union Trader | Built 1975 Tonnage 4,377 see Union Melbourne. | |
| Union Transtasman | Built 1972 Tonnage 3,165 1977 chartered from Deep Sea Shipping Co., Wellington. | |
| Union Wellington | Built 1973 Tonnage 2,541 ex- Stena Shipper, 1973 purchased from Stena A/B, Stockholm and renamed Union Wellington, 1976 sold renamed Alpha Express. | |
| United Brothers | Schooner | Built **** Tonnage 50 |
| Unity | Ketch | Built **** Tonnage 44 |
| Uno | Built **** Tonnage *** | |
| Upolu | Built 1891 Tonnage 1,141 1903 sold to Lever's Pacific Plantations Ltd, Sydney. | |
| Urenui | Built **** Tonnage *** | |
| Ureroa | Scow | Built 1902 Tonnage *** |
| Ururoa | Built **** Tonnage *** | |
| Utumapu | Schooner | Built 1887 Tonnage 15 |