Rosmini College is a Catholic College committed to the philosophy of Fr. Antonio Rosmini, which stresses that "Charity fulfils the Law". Essential Christian values are emphasised in the College's archdiocesan and pastoral approach to student problems.

The teaching of Religious Education is an essential part of the College's Catholic mission. Classes at all levels, from Year 7 to Year 13, receive formal instruction in Religious Education each week and tests are conducted each term. The syllabus for Religious Education follows that devised by the National Catholic Education Office, and at secondary level encompasses courses in Human Relationships as well as Catholic Dogma.

As part of the College's religious mission, there are regular class and school masses, liturgies and reconciliation. Some of our senior pupils have been appointed as Special Ministers for the Eucharist and serve in their home parishes as well as at school masses. We also have a number of our boys taking part in the Diocesan Youth Ministry.

Students are encouraged to participate fully in the Catholic Character of the school. The Catholic Character Group provides assistance with all school liturgies as well as leadership and co-ordination of the numerous social justice programmes the college is involved with.

Senior boys can join the Young Vinnies, which is a group who live out the school motto through practical acts of charity that included volunteering at De Paul House Homework Centre, manning the Vincent De Paul Hospice shop and visiting the elderly.

A voluntary lunchtime Mass is held each week. The College Chapel is also open for private prayer.

All pupils are expected to attend the retreats held for their year level.