The 19 defendants, including three Australians from the sales and marketing team of Australia's Crown Resorts Ltd., appeared at a court in Shanghai. Casino gambling, the marketing of casinos and organizing overseas gambling trips involving 10 or more people are illegal in China.
"The three Australians and the other defendants pleaded guilty," the Australian Consul General in Shanghai, Graeme Meehan, said outside the Baoshan District People's Court.
Their sentences start from the date they were detained, which was October 14, he added.
At least half of the 19 had been on bail awaiting trial, according to an officer from the court's propaganda office who only gave his surname, Li.
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Crown's vice-president in China, Malaysian Alfread Gomez, was also among the defendants.
Casino gambling and the promoting of gambling are illegal in mainland China and agents are banned from organizing groups of more than 10 Chinese citizens to gamble abroad. According to Chinese law, anyone who "runs a gambling house or makes gambling his profession" can face up to three years in prison.
The industry has been known to skirt China's ban by touting destination packages rather than gambling, particularly as Chinese President Xi Jinping's ongoing corruption crackdown has deterred some gamblers from Macau.