Ivar Martinsen
| full name | Karl Ivar Martinsen | |
| nationality | Norway (NOR) | |
| born | December 1920 | in Løten (Norway) |
| died | September 2018 | in Stange (Norway) |
Championships - Medal table and top 10 positions
| kampioenschap | gold | silver | bronze | 4th-6th | 7th-10th | starts |
 Olympic Games | 0 | 0 | 0 | 0 | 1 | 2 |
| WCh Allround | 0 | 0 | 1 | 1 | 2 | 4 |
 ECh Allround | 0 | 0 | 1 | 0 | 1 | 3 |
Championships - Results
| year | position | championship | place | |
| 1948 | 16 | Olympic Games 1500 meters | St. Moritz | SUI |
| 12 | ECh Allround | Hamar | NOR | |
| 1950 | 6 | WCh Allround | Eskilstuna | SWE |
| 1952 | 8 | Olympic Games 1500 meters | Oslo | NOR |
3  | WCh Allround | Hamar | NOR | |
| 7 | ECh Allround | Östersund | SWE | |
| 1953 | 9 | WCh Allround | Helsinki | FIN |
| 3 | ECh Allround | Hamar | NOR | |
| 1954 | 10 | WCh Allround | Sapporo | JPN |
