St Leonard's was the first school in Victoria, and second in Australia, to offer the International Baccalaureate in addition to the more widely used Victorian Certificate of Education.

The school is in close proximity to Port Phillip Bay and 11 kilometres south east of the Central Business District.

Opened in January 2021, the theatre features an auditorium (seating up to 600) with a half fly tower housing a curtain rigging system and lights, and an orchestra pit.

Behind the theatre is located an agora with a large screen and an outdoor stage approximately 30 metres in diameter.

[7] Previous events hosted at the Leonardian Centre include:[8] Students are assigned a house once enrolled at the College for the duration of their attendance.

While the BYOD program enables most students to complete all of their digital learning, the school also has computers.

Students studying Information Technology, Media and Visual Design do so using the school-owned computers and software.

Recent productions have included Matilda JR., Madagascar JR., Just MacBeth, Legally Blonde, Romeo and Juliet, Frozen Jr., Our Town, Bugsy Malone, Mamma Mia!, Picnic at Hanging Rock, The Wizard of Oz, Dr Dolittle Jr., A Midsummer Night's Dream, Chicago - High School Edition, and Grease.

In the same year the Middle School production of Beauty and the Beast was awarded Junior Male Performer in a Supporting Role.

[17] The St Leonard’s College Big Band achieved 1st place in the premier division of the Victorian All-State Jazz Championships in 2021 and 2022.

Lennie's van is a community social action project run by St Leonard's since 2018.

It provides breakfast, lunch and dinner to residents of social housing in the neighbouring area.

[30][better source needed] All year 9 students complete local service activities as part their experiential learning program – CUE (Community, Urban, Environment).

In 2012, 2013, 2014 and 2016 the St Leonard's College adventure racing team won the national Hillary Challenge,[32] an interschool competition which tests basic outdoor skills and competencies.