The Friday holiday will be available for anyone who works in the Brisbane City Council area.
Police Minister Jack Dempsey said the government was making the announcement on this Queen’s Birthday long weekend to help people plan their long weekend in 2014.
“There will be a large amount of traffic congestion but by doing this the retailers are able to plan ahead,” he told reporters in Brisbane on Monday.
The public holiday also coincides with Prince Charles’s 66th birthday.
“Prince Charles is certainly invited to come to Queensland any time as well as any of the royal family,” Mr Dempsey said.
The minister said transport routes and accommodation used by world leaders would have tight security.
“People have to be mindful there will be a number of restrictions in the CBD area in relation to traffic movements as well as other bus and other rail movements,” Mr Dempsey said.
The G20 public holiday plan is modelled on the Brisbane Ekka holiday in August, which only applies to people who work in greater Brisbane.
The G20 summit will be held on November 15 and 16 next year, and will host US President Barack Obama.