St Mary's has won a number of awards at the State and National levels in Sports, Science Exhibition and Theatre activities. It is a proud feeling that our Institution has been honoured with International School Award by the British Council, India, successively for two terms, recognizing its outstanding efforts in designing creative co-curricular activities. The school was honoured with THE PRIDE OF CATHOLIC CHURCH award by the Catholic Bishops' Conference of India (CBCI), New Delhi in 2017, recognizing the school's wide-ranging achievements in academic and co-scholastic activities.

The School has been awarded with National level Eco Waste Management Handprint Flag award -2020 for the successful implementation of innovative waste management ideas at school, home and community level and also finding effective solutions to local environmental issues by Centre for Environment Education (CEE), Foundation for Environmental Education (FEE) and the Bestseller Foundation.