The flag will be flown outside the the City’s administration building during the first week of each month and the Aboriginal flag will be raised for the remainder of the month.
The City also permanently flies the Australian and West Australian flags.
Indigenous Commonwealth Games hurdler and Baldivis resident Shannon McCann had the honour of raising the flag for the first time on Monday.
“Flying the Aboriginal and Torres Strait Islands flags is the result of significant collaboration and consultation with the local Aboriginal community,” Mayor Barry Sammels said.
The flag represents key elements of the Torres Strait Islands culture, with the two green lines representing mainland Australia and Papua New Guinea, the blue representing Torres Strait waters and the black lines representing the Torres Strait people. The central symbol, the dhari, is the ceremonial headdress of the Torres Strait Islands, and the five-pointed star represents the five major island groups of the Torres Strait.