| I Gymnasium Osijek | |
| Native Name: | I. gimnazija Osijek |
| Coordinates: | 45.5593°N 18.6753°W |
| Headmaster: | Dražen Đapić[1] |
| Classrooms: | 11 |
I Gymnasium Osijek (hr|I. gimnazija Osijek) is a high school in Osijek, Croatia.
The school was established on 1 September 1992, when Assembly of Osijek Municipality reorganized Center for vocational education "Ribar Brothers" (hr|Centar za usmjereno obrazovanje "Braća Ribar").
From school year of 1991-92 till 1999-00 in school was realized part of program of general gymnasium for students of Franjo Kuhač Music School.