Established 1956
Heritage. Excellence. Character.
Isonyin Grammar School — a flagship co-educational secondary school in Isonyin-Ijebu, Ogun State, educating young people since March 23, 1956.
Since 1956
A school built by a community, for its children
Isonyin Grammar School is a co-educational secondary school established on March 23, 1956 and located in the heart of Isonyin-Ijebu, Ogun State. It is one of the flagship schools of the Ogun State Government and the only Model Secondary School with boarding facilities in Ijebu North East.
The school is equipped with a professional library, science and ICT laboratories, and a carpentry workshop in line with the Federal Government's TVET policy.
1956
Founded
100+
Hectares of campus
70
Years in 2026
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Lamidi Y. O.
Principal, Isonyin Grammar School (Senior)
From the Principal
Welcome to Isonyin Grammar School!
As the principal of Isonyin Grammar School, it is my pleasure to extend a warm welcome to you. We are thrilled to have you visit and explore our online space.
Isonyin Grammar School is a distinguished co-educational secondary school established on March 23, 1956, and located in the heart of Isonyin-Ijebu, Ogun State. As one of the flagship schools of the Ogun State Government and the only Model Secondary School with boarding facilities in Ijebu Northeast, we are proud of our rich heritage, academic excellence, and the global impact of our alumni.
Our school is fully equipped with modern infrastructure, including a professional library, science and ICT laboratories, and a carpentry workshop in line with the government's TVET policy. We are committed to 21st-century learning through the use of Educational Technology and globally recognized pedagogies such as the PSI/PMI initiative developed by the New Jersey Center for Teaching and Learning, U.S.A., adopted by the Ogun State Government and implemented through OGSTEP with the support of the World Bank. It's the first of its kind in Nigeria.
Isonyin Grammar School… God is our Foundation!
Lamidi Y. O. — Principal, Isonyin Grammar School (Senior)
Read the full welcome messageWhat we stand for
Five values that shape every student
Academic Excellence
A rigorous curriculum and dedicated teaching staff committed to learning and academic development.
Character
Building disciplined, responsible and confident young people — a tradition since 1956.
Leadership
Preparing students to serve, to lead and to carry the school's name with pride.
Community
A school deeply rooted in Isonyin, supported by its people, its traditional leadership and its professors.
Heritage
Seven decades of education in Ijebu North East, and generations of families who call this school theirs.
Platinum Jubilee
IGS @ 70 — Still Soaring at Seventy
23rd – 29th March 2026
23 Mar
Back to School & Press Conference
IGS Campus, 10:00 AM
24 Mar
Debate/Quiz & Anniversary Lecture
Lecture by Mr. R. B. Lawal, 3:00 PM
28 Mar
Grand Finale & Social
Projects commissioning, awards & live band
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Diary
Upcoming events
23 March 2026
Back to School & Press Conference
10:00 · IGS Campus
24 March 2026
Debate/Quiz & Anniversary Lecture
15:00 · School Hall
28 March 2026
Grand Finale & Social
11:00 · IGS Campus