A joint investigation by the Australian Broadcasting Corporation and Fairfax Media said secret files showed officials from the central bank's scandal-hit Note Printing Australia (NPA) went to Iraq to discuss a contract to turn the country's paper currency into polymer notes.
During the 1998 trip, codenamed Delta Project, they met a middleman -- former dictator Hussein's brother-in-law and bodyguard Arshad Yassin, the reports said.
"Indications from Arshad Yassin's office are that Saddam Hussein's office has already allocated USD 65 million for the total project," RBA officials said in one document, the media groups reported.
Reserve officials working for NPA said the funds could potentially be accessed by funnelling them through a Jordanian bank "with the green light of SH (Saddam Hussein)," it was alleged.
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The operation was called off six months later after Australian diplomats uncovered the secret dealings with the brutal regime, according to the ABC.
The RBA admitted officials made the trip, as calls mounted for a full inquiry.
"The visit in 1998 was, in the opinion of the bank, ill-advised," it said in a statement.
David Chaikin, a legal expert at the University of Sydney who reviewed the confidential bank documents, said the negotiations were a violation of international law and alarm bells should have been sounded "to the highest levels of the bank".
"What was happening is not only in violation of law, but could potentially destroy and undermine the reputation of Note Printing Australia and its owner, the Reserve Bank," he told the broadcaster.
NPA has been plagued by allegations of corruption in recent years, with claims it and another RBA subsidiary Securency paid bribes to win plastic bank note contracts in Asia.
Executives from both companies have been charged over the alleged racket, which involved contracts in Indonesia, Malaysia, Vietnam and Nepal, following an investigation by Fairfax in 2009.