Gonzaga College SJ is a voluntary Catholic boys' secondary school in Ranelagh, Dublin, Ireland. Founded in 1950, Gonzaga College is under the trusteeship of the Society of Jesus, one of five Jesuit secondary schools in Ireland. The curriculum is traditional, with a broad general programme of subjects including Latin and Greek at Junior Cycle and the opportunity in Senior Cycle to study eight subjects for the Leaving Certificate.

Ranelagh is an affluent residential area and urban village on the Southside of Dublin, Ireland in the postal district of Dublin 6.