The flag for the Sunshine State has changed four times since it was proclaimed a separate colony from NSW in 1859.
An 1859 separation flag was followed by revised state flags in 1870, 1876, 1901 and 1952.
The latest version features a navy background and Union Jack like the Australian flag, but it has the state's round badge instead of the Southern Cross or the Commonwealth star.
That badge features a stylised crown, representing the monarchy, superimposed on a pale blue Maltese cross.
The crown changed on the state's flag when Edward VII asked for his royal cypher to use a Tudor crown after he ascended the throne in 1901.
When his great-granddaughter Queen Elizabeth II used St Edward's Crown, after using that regalia in her own coronation in 1952, the Queensland flag was tweaked again.
King Charles III wore a badge featuring his initials and what appeared to be the Tudor crown at his accession ceremony on Friday.
He's reportedly planning to use the same Tudor crown used by Edward VII in his royal cypher, according to the UK's Telegraph newspaper.
It's understood there's no legal requirement for Queensland's badge and flag to mirror the Royal Cypher, but the Department of Premier and Cabinet told AAP they are checking protocols.
Attorney-General Shannon Fentiman says all government departments are checking their royal protocols, which haven't been closely studied for 70 years.
"There are protocols put in place between the Commonwealth and the states that have been in place for many, many decades," she told reporters on Monday.
"So you know, all government departments will follow that advice. But at this stage, I don't have any of the details about what is involved in each department with the change of a monarch."
Regardless of the new King's decision, the opposition Liberal National Party wants Queensland's flag to stay the same.
"The outpouring of grief and love for her Majesty shows how important enduring symbols of strength and stability are to Queenslanders," a spokesperson told AAP.
"Symbols like the Queensland flag represent our great state now and into the future. It's important respect for these symbols continues."
Meanwhile, Ms Fentiman also said there were no plans to change the name of the Queen's Birthday Long Weekend in the state.
However, any future change to the name of the October public holiday wouldn't need to be legislated as it's formally known as The Sovereign's Birthday under state laws.
