| Guðni Kjartansson | |
| Birth Date: | 10 December 1946 |
| Birth Place: | Iceland |
| Position: | Defender |
| Years1: | 1965–1978 |
| Clubs1: | Keflavík |
| Nationalyears1: | 1967–1973 |
| Nationalteam1: | Iceland[1] |
| Nationalcaps1: | 31 |
| Nationalgoals1: | 0 |
| Manageryears1: | 1975 |
| Managerclubs1: | Keflavík |
| Manageryears2: | 1976 |
| Managerclubs2: | Keflavík |
| Manageryears3: | 1978 |
| Managerclubs3: | Keflavík |
| Manageryears4: | 1979 |
| Managerclubs4: | Keflavík |
| Manageryears5: | 1980 - 1981 |
| Managerclubs5: | Iceland |
| Manageryears6: | 1981 |
| Managerclubs6: | Keflavík |
| Manageryears7: | 1983 |
| Managerclubs7: | Keflavík |
| Manageryears8: | 1989 |
| Managerclubs8: | Iceland |
| Manageryears9: | 1991 |
| Managerclubs9: | KR |
Guðni Kjartansson (born 10 December 1946)[2] is an Icelandic football manager and former player, who played as a defender. He managed the Iceland national team from 1980 to 1981.[3]