Nine people have been charged with more than 100 fraud-related offences by Victoria's anti-corruption body, after an investigation into contracts awarded by the state's public transport department.

The Independent Broad-based Anti-Corruption Commission (IBAC) said the charges included conspiracy to cheat and defraud, obtaining financial advantage by deception, misconduct in public office, giving and receiving secret commissions and furnishing false information.

A company has also been charged.

The charges come after IBAC's Operation Fitzroy, which investigated the circumstances around the awarding of lucrative contracts for transport infrastructure and railway car parks by the former Department of Transport and Public Transport Victoria between 2006 and 2013.

It also examined whether staff members, or people associated with them, stood to benefit from those contracts.

Last year it held public hearings into claims a web of companies was used to sell public transport infrastructure to the Government at an inflated price.

They were the first hearings held by the anti-corruption commission.

Those charged will face the Melbourne Magistrates Court next month.