One of the hallmarks of a strong and progressive 21st century school is its ability to connect with a wide range of relevant networks and associations. Below is a list of some of those groups and associations to which the college belongs or is affiliated.
- Australia Province of the Marist Brothers
- Marist Schools Australia
- Archdiocese of Melbourne
- Catholic Education Commission of Victoria
- Catholic Education Office of Melbourne
- Principal’s Association of Victorian Catholic Secondary Schools (PAVCSS)
- Victorian Catholic Secondary Schools Deputy Principals Association (VCSSDPA)
- Association of Heads of Independent Schools of Australia (AHISA)
- International Boys’ School Coalition (IBSC)
- Associated Grammar Schools of Victoria (AGSV)
- Victorian School Rugby Union (VSRU)
- Marcellin College Community Association (MCCA)
- Marcellin Old Collegians Association (MOCA)
- Marist Cricket Carnival 2015