| Ivica Grnja | |
| Birth Date: | 1949 4, df=y |
| Birth Place: | Darda, PR Croatia, FPR Yugoslavia |
| Position: | Striker |
| Years1: | –1972 |
| Clubs1: | Metalac |
| Years2: | 1972–1980 |
| Clubs2: | Osijek |
| Years3: | 1976 |
| Clubs3: | Toronto Metros-Croatia |
| Caps3: | 5 |
| Goals3: | 1 |
| Years4: | 1979 |
| Clubs4: | Tampa Bay Rowdies |
| Caps4: | 10 |
| Goals4: | 0 |
| Totalcaps: | 15+ |
| Totalgoals: | 1+ |
| Manageryears1: | 1991 |
| Managerclubs1: | Osijek |
| Manageryears2: | 1993–1994 |
| Managerclubs2: | Osijek |
| Manageryears3: | 2005 |
| Managerclubs3: | Croatia U21 |
| Manageryears4: | 2008–2011 |
| Managerclubs4: | Croatia U19 |
Ivan "Ivica" Grnja, also known as John Grnja (born 26 April 1949) is a Croatian football manager and former professional player.
Grnja joined NK Osijek from Metalac Osijek in 1972, forming a formidable striking partnership with Ivan Lukačević[1] and played in the North American Soccer League for the Toronto Metros-Croatia and the Tampa Bay Rowdies.[2]
Grnja has managed Croatian club side NK Osijek on two occasions – in 1991, and between 1993 and 1994.
Grnja also managed the Croatia under-21 side in 2005,[3] and the under-19 side in 2008.[4]