Senior station officer (SSO) is a rank in some fire services in Australia and New Zealand.
The highest pay classification in the fire service industrial award is "senior station officer".
At most Fire Rescue Victoria (FRV) stations with multiple appliances, an SSO is assigned as the officer-in-charge of the "A" pumper on each shift.
In both career and volunteer situations, an SSO reports to a CFO.
In New Zealand, the senior station officer rank insignia is two impellers.