Willoughby Girls High School places importance on activities that bring girls together for reasons other than academic achievement. These activities include carnivals, charity days, camps, festivals and co-curricular activities.
The School provides many co-curricular opportunities including an extensive sporting program and music ensembles managed by the school's parents and citizens' association (P&C), dance, drama, the Duke of Edinburgh Award Scheme, vocal ensembles, as well as debating and public speaking programs, and a range of student leadership programs.