The Boyzone frontman is currently taking his Fires shows across Europe, and will head Down Under on 1 March to begin the Aussie leg of the tour.
However, Keating has been forced to pull the Sydney stop at the Newcastle Entertainment Centre, citing "unforeseen circumstances".
A statement posted on the venue's website read: "Due to unforeseen circumstances, McManus Entertainment must regrettably cancel Ronan Keating's Fires Live 2013 show at Newcastle Entertainment Centre on Tuesday 5 March.
"Although the Newcastle Entertainment Centre date has been cancelled, Ronan Keating will tour Melbourne, [the State Theatre in] Sydney, Brisbane, Gold Coast and Perth from Friday 1 March. His Fires Live 2013 Australian Tour will feature good friend and fellow Irishman Brian McFadden as special guest."
Keating is a judge on the Australian version of The X Factor.