It will be free to get into Urban Council museums every Wednesday from next week.
The new measure, aimed at attracting more visitors, will be introduced at the museums of art, history, science and space.
The council will still charge for performances at the Space Museum's Space Theatre.
Admission to the museums of art, history and space is $10. It costs $25 to get into the Science Museum. There are concessions for students, the disabled and senior citizens.
The Museum of Art and the Museum of History open 10 am to 6 pm weekdays, and 1 pm to 6 pm Sundays and public holidays. The Science Museum and Space Museum open 1 pm to 9 pm weekdays, and 10 am to 9 pm Saturdays, Sundays and public holidays.
The museums each close on different days.