Multi-denominational body Educate Together is to run five of the nine new schools scheduled to open their doors in 2015 and 2016.
The nine new schools are being established to cater for significant increases in the school-going population.
Three of the nine new schools will be in Cork, while others will open in counties Dublin, Wicklow and Kildare.
The other new schools will be run by local Education and Training Boards and the Catholic Church, some with shared patronage.
Already well established at primary level, Educate Together is due to open its first three second-level schools next year.
Today's announcement brings the number of second-level schools it will run to eight.
In 2015 and 2016, Educate Together will open new schools in Cork, north Wicklow, and Balbriggan and Ballinteer in Dublin.
It will share patronage of a fifth school in Kildare with the local Education and Training Board, although this school is subject to confirmation of parental support.
Local Education and Training Boards will also open two new schools in Cavan and in Tallaght in Dublin.
They will also share patronage of another new Cork school with the Catholic Church.
A third new school for Cork will be run by the Catholic Edmund Rice Schools Trust.
Minister for Education Ruairi Quinn said he was confident the new schools, alongside existing schools, would mean that parents and students had real choice when it came to finding a school that would reflect their own ethos.