The air-conditioned auditoria with most up-to-date acoustics to add to the institution's communication and activity facilities. An essential wing of the School infrastructure, the auditorium serves multiple purposes throughout the year.

The St. Peter's School auditorium can seat 300-plus people . Regular recreational activities and celebrations at the auditoria include the Investiture Ceremony, Christmas Parties, Inter-House Competitions, Teachers' Day Celebrations, co-curricular classes, career counselling sessions, seminars and workshops for teachers and pupils. The auditorium is the nerve centres of School, of a large number of educational, cultural and social functions. While they are easily accessible from all classrooms, activities at the auditoria do not disturb teaching and learning in any of them.