O
| Ship Name | Year Launched | Renamed | Fate |
|---|---|---|---|
| RMS Oceanic (1870) | 1870 | No | Broken up in 1896 |
| RMS Oceanic (1899) | 1899 | No | Ran aground off, Foula, Shetland on September 8, 1914 fully scrapped by 1974 |
| Oceanic (unfinished ship) | Never Launched | - | Partly built hull was deconstructed, and melted down to make the smaller "Britannic" and "Georgic" |
| SS Oceanic (1965) | 1963 | Yes (4 Different names) | Sold for scrap in June 2012 |
| SS Olympia (1895) | 1883 | Yes (2 Different names) | Ran aground on December 10, 1910 |
| SS Olympia (1953) | - | Yes (3 Different names) (See: MS Regal Empress) | - |
| RMS Olympic | 1910 | No | Scrapped in 1937 |
| MS Oranje | 1938 | Yes (2 Different names) | Destroyed by fire on March 30, 1979 and sank. |
| RMS Orbita | 1914 | No | Scrapped in 1950 |
| SS Orcades (1937) | 1937 | No | Torpedoed and sunk on October 10, 1942 by German submarine U-172 |
| SS Orcades (1948) | 1947 | No | Broken up in 1973 |
| SS Orduna | 1913 | No | Scrapped in Scotland in 1951 |
| SS Oriana (1959) | 1959 | No | Broken up in 2005 |
| RMS Orion | 1934 | No | Broken up in 1963 |
| SS Oronsay (1925) | 1924 | No | Torpedoed and sank off Liberia on October 9, 1942 |
| SS Oronsay (1951) | 1951 | No | Broken up in 1975 |
| SS Orontes | 1929 | No | Scrapped at Valencia, Spain in 1962 |
| SS Orsova (1909) | 1909 | No | Broken up in 1936 |
| SS Orsova (1954) | 1953 | No | Scrapped in Taiwan in 1974 - 1975 |
| MS Oslofjord (1938) | 1938 | No | Sunk in 1941 after hitting a mine. |
| MS Oslofjord (1949) | 1949 | Yes (2 Different names) | Sunk in 1970 after catching fire and while being towed. |
| SS Otranto | 1909 | No | Sank after a collision on October 6, 1918 |
| SS Otway | 1909 | No | Torpedoed and sunk off the Hebrides on July 23, 1917 |
| SS Oxfordshire | - | Yes (2 Different names) (See: TSS Fairstar) | - |
Read more about this topic: List Of Ocean Liners