Prendiville Catholic College in Ocean Reef and Irene McCormack Catholic College in Butler received plaques to recognise their donations to the charity.
LifeLink support the homeless, victims of domestic violence, those with addictions, intellectual and physical disabilities, the aged, refugees and others facing life challenges.
Archbishop Costelloe spoke at Prendiville Catholic College before attending a morning tea with the students.
Principal John Aldous said the students found Archbishop Costelloe personable and easy to talk to.
Irene McCormack Catholic College principal Robert Marshall said the college was honoured to received the recognition. s