| Kaarlo Niilonen | |
| Birth Date: | 1922 6, df=yes |
| Birth Place: | Kotka, Finland |
| Death Place: | Frederikshavn, Denmark |
| Position: | Midfielder |
| Years1: | 1939–1946 |
| Clubs1: | Kotkan Työväen Palloilijat |
| Nationalyears1: | 1943–1946 |
| Nationalteam1: | Finland |
| Nationalcaps1: | 3 |
| Nationalgoals1: | 0 |
| Manageryears1: | 1954–1956 |
| Managerclubs1: | FC Solothurn |
| Manageryears2: | 1958–1960 |
| Managerclubs2: | Viborg FF |
| Manageryears3: | 1960–1968 |
| Managerclubs3: | Aalborg BK |
| Manageryears4: | 1969–197? |
| Managerclubs4: | Aalborg BK |
| Manageryears5: | 1976–1978 |
| Managerclubs5: | Frederikshavn fI |
| Manageryears6: | 1979 |
| Managerclubs6: | Hjørring AIK Frem |
Kaarlo Niilonen (3 June 1922 – 24 February 1996) was a Finnish football player and manager.