The decision has prompted an online petition calling for Collins Foods to reconsider.
“This is a desperate plea to Collins Foods Limited,” said petitioner Rachel Titmarsh.
“Please don’t leave Rockhampton.”
On Tuesday afternoon, the petition was fewer than 400 signatures short of its target of 1000.
Known for its unlimited cheesy bread and salad bar, Sizzler was once one of Queensland’s most popular restaurant chains after opening in Kedron in Brisbane in 1985.
But there will be as few as nine remaining country-wide next month - five in Queensland (Caboolture, Loganholme, Maroochydore, Mermaid Beach and Toowoomba), one in NSW (Campbelltown) and three in Western Australia (Innaloo, Kelmscott and Morley).
The Rockhampton restaurant is one of several to be closed in recent years.
It goes the way of installments at Ipswich, Brookside, Toowong, Carindale and Bundaberg in Queensland and Sydney’s Kogarah.
This story first appeared on 7NEWS.com.au