Bartenders and card dealers at Melbourne's Crown Casino will walk off the job for two hours this Friday night, in the first of a series of industrial actions their union has warned will continue through the Spring Racing season.

The union, United Voice, said on Monday that its members - which include card dealers, bar and restaurant staff, hotel workers and security guards - had voted overwhelmingly in favour of taking industrial action amid stalled negotiations over a new wage deal.

Crown workers say they will walk off the job on Friday night. Credit:Joe Armao

United Voice said casino workers would walk off the job for two hours this Friday night "leaving bars and restaurants unattended and gaming rooms without dealers", in the first strike action at the Southbank complex for 16 years.

Workers would decide on Friday night on whether or not to continue action on the following day, the union said. Saturday is Derby Day at Flemington racecourse, the first major meeting for Melbourne Cup week.