At St Mary’s Cathedral Catholic College Sydney, all staff work collaboratively within their roles to achieve the best possible outcomes for our community.
| College Principal | Mrs Kerrie McDiarmid |
| Assistant Principal: Senior School | Mr Christopher Maoudis |
| Assistant Principal: Middle School | Mr David Timillero |
| Assistant Principal: Junior School | Ms Suzanne Georgiou |
| Assistant Principal: Liberal Arts | Ms Belinda VanderGert |
| Assistant Principal: Mission | Mr Thomas Hunter |
| Leader of Curriculum & Assessment | Ms Anne Ung |
| Leader of Pathways & Partnerships | Mr Ashley Norman |
| Leader of Wellbeing K-12 | Ms Kathleen McGrath |
| Leader of Operations & Administration | Mr Chau Dinh-Vu |
| Years 5 & 6 | Ms Rosa-Lia Mascera |
| Year 7 | Ms Maire Sheehy |
| Year 8 | Mr Les Rolls |
| Year 9 | Ms Monica Zanuttini |
| Year 10 | Mrs Clementina Getley |
| Year 11 | Mr Ross Ashdown |
| Year 12 | Mr Ben Lynch |
| Leader of Diverse Learning | Mr Steven Foulger |
| Leader of Learning Music | Ms Alison Hunter |
| Instructional Leader Music (Yrs 5-8) | Mr Stefanovych Roberts |
| Instructional Leader English (Yrs 9-12) | Mr Andrew Kuchappan |
| Instructional Leader Maths (Yrs 9-12) | Mr Steven Casimiro |
| Instructional Leader Science (Yrs 9-12) | Mr Adrian Claydon |
| Instructional Leader Philosophy (Yrs 9-12) | Mr Matthew Mastrobattista |
| Instructional Leader HSIE (Yr 9-12) | Mr Ashley Pereira |
| Instructional Leader Humanities (Yrs 5-8) | Mr Nicholas Puiu |
| Instructional Leader TAS (Yrs 7-12) | Ms Julia Hepworth |
| Instructional Leader VET (Yrs 9-12) | Mr James King |
| Instructional Leader STEM (Yrs 5-8) | Ms Danielle van der Meer |
| Instructional Leader Creative and Performing Arts (Yrs 3-12) | Ms Michele Marshall |
| Instructional Leader Languages (Yrs 3-12) | Ms Elyse Williams |
| Instructional Leader RE Curriculum (Yrs 7-12) | Ms Charlotte Claxton- Fante |
| Instructional Leader RE Curriculum (Yrs 3-6) | Ms Fiona Roy |
| Instructional Leader Co-curricular / Sport | Mr Simon Shaw |
| Instructional Leader PDHPE (Yrs 7-12) | Mr Peter Bottrill |
| Duke of Edinburgh | Ms Clementina Getley |
| Youth Ministry Coordinator | Mr Thomas Rodriguez |
| Leader of Diverse Learning | Mr Steven Foulger |
| College Counsellor | Ms Jennifer Jamieson |
| Librarian / Teacher | Mr Edward Hawkins |
| Business Manager | Ms Margaret Grant |