Tabcorp has been fined more than $370,000 after admitting it failed to stop children from gambling across multiple Victorian venues.

The company pleaded guilty to 43 charges in Melbourne Magistrates Court after first being charged by the Victorian Gambling and mksports Casino Control Commission in May 2023.

The commission had found a 17-year-old gambled multiple times between May 2022 and October 2023 at 13 Tabcorp sites.

The company admitted failing to prevent a minor from gambling and not properly supervising its electronic betting terminals.

A magistrate on Thursday ordered the company to pay $370,417 in fines.

The commission's chief executive Annette Kimmitt said Tabcorp had committed incredibly serious breaches. 

"These failures undermine the integrity and safety of the industry," she said in a statement.

"Gambling providers and their staff are on the frontline of our efforts to prevent underage gambling.

"It is their duty to rigorously check IDs and supervise gambling activities to ensure minors are not able to access these services."

Tabcorp has been approached for comment.