Senior assistant commissioner is a rank used in the Singapore Police Force and in the New South Wales Police Force of Australia.
The rank of senior assistant commissioner is only used in the New South Wales Police Force, where it is senior to the rank of assistant commissioner and junior to the rank of deputy commissioner. The rank insignia is crossed and wreathed tipstaves surmounted by a star, equivalent to the rank of major-general in the army.
In Singapore, a senior assistant commissioner of Police (abbreviation: SAC, Chinese: 高级助理警察总监) is a police rank of a senior officer in the Singapore Police Force above the rank of assistant commissioner and below that of a deputy commissioner of police
Hong Kong Police senior assistant commissioners are responsible for either headquarter command roles or regional/geographic commands. SAC are head of departments and also referred to as Directors of these departments.