Plastic straws, helium balloons and single-use bottles have been banned from all Brisbane City Council operations and events.
Vendors at council-run events will not be able to supply the items, however, patrons can still bring their own, following a vote on Tuesday night.
"We can't stop people bringing them in," council's environment, parks and sustainability chairman David McLachlan told ABC Radio on Thursday.
Council-sponsored events also will be encouraged to adopt similar practices which could further cut down on plastics entering the city's waterways.
Last month, British Prime Minister Theresa May laid out plans to ban single-use plastics, including straws, drink stirrers and cotton buds, to stop pollution.
Prime Minister Malcolm Turnbull wouldn't commit to doing the same in Australia, saying it was a matter for state regulation.
Queensland Environment Minister Leeanne Enoch has told News Corp Australia she will consider council's decision in detail.