St Marys South Public School is a small to medium-sized government primary school located in St Marys, Sydney, catering for students from K-6.

Recent primary results suggest more modest academic performance, with a latest primary rating of 3.9.

Recent results have softened compared with earlier years, although year-to-year cohort variation should be considered.

The school serves a less advantaged student community, with an ICSEA score of 945 placing it around the top 78% nationally by ICSEA.

Compared with similar state-sector ICSEA peers, recent results appear somewhat below expected levels.

With around 319 students, the school is a smaller school by metropolitan standards.