The country is in the top five destinations for Italians planning trips away.
Visitor numbers to Titanic Belfast and the Giant’s Causeway were boosted by the locations featuring during the start of the famous cycling race in 2014.
The numbers visiting Northern Ireland rose by around 13% the year of the Giro and indications are that the improvement has been maintained, Tourism Ireland chief executive Niall Gibbons said.
He added: “The Giro was one of the best showcases that Northern Ireland had.
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“There is a significant increase in the tourism offering here with Titanic Belfast and the investment in the Giant’s Causeway.
“The sentiment has been very positive.”
Normally, Spanish and Italian visitors are counted together.
Numbers at the Titanic visitor centre increased by 9% and at the Giant’s Causeway by 22%.
Mr Gibbons said the value of the television coverage of the Giro was worth £5.5 million in advertising.
The Giro began at the Titanic slipway where the vessel was built.
It swept from there up to the North Coast and passed near the Causeway, during a circuitous route back to Belfast along the Co Antrim coastline.
Some 71% of all Italian visitors to Northern Ireland came specifically for holidays, Tourism Ireland said.
A new Ryanair direct route from Milan to Belfast is due to launch in September.
Mr Gibbons added: “Spain and Italy have performed extremely well for tourism to Northern Ireland and the island of Ireland in recent years and the future is undoubtedly bright.
“We believe that both are markets of considerable potential over the coming years.”