Australia does not have a single national regulatory standard that mandates specific hard hat colours. The colour conventions widely seen on Australian worksites are industry practice, not law - they are defined by the principal contractor and set out in each project's site safety plan and induction documentation.
The most common Australian site colour conventions are below:
White - Site managers, engineers, supervisors, architects
Yellow - General labourers and plant operators
Orange - New or visiting workers, traffic controllers, inductees
Blue - Tradespeople (electricians, plumbers, carpenters)
Green - Safety officers and first aiders
Red - Fire wardens; sometimes used for subcontractor supervisors
Fluoro Yellow - High-visibility requirement areas; plant exclusion zones
Always confirm the colour scheme at site induction — the same colour can mean different roles on different projects. The only compliance requirement under AS/NZS 1801 is that the helmet meets the standard - colour is a site management and identification tool, not a safety specification.
From 25 years of selling Hard Hats - 95% of them are white, the majority of others were based on a Companies brand/colour preferences.