Concert organizers indicated that the decision was not connected to the outcry, saying that production delays had forced them to scrap the June 15 concert in the capital's Stadio Flaminio, the singer's first-ever concert in Italy and the start of her European tour.
"We met with unexpected production delays," according to a statement by tour promoter Michael Cohl posted on the Web site of Milano Concerti, the Italian organizer of the event.
"We deeply apologize to the fans in Rome," Cohl said in the statement, adding that ticket holders would be refunded and given the opportunity to book a spot for one of Streisand's other European concerts.
Organizers were not immediately available Monday morning for further comment.
Last week, consumer groups Codacons and Adusbef protested as "absurd and shameful" ticket prices ranging from just under EUR (US$200) to more than EUR (US$1,200), calling on authorities to deny Streisand use of the 24,000-seat stadium.
The stadium "is public property and cannot be used for immoral deals that are shameful to a civilized country," the groups said in a statement.
Instead of the Rome concert, Streisand's Web site listed a new date - June 18 concert in Zurich, Switzerland - as the kickoff for the star's tour.
Streisand's 2006 U.S. tour was ranked the second-grossing tour in North America last year, generating US$92.5 million (EUR68.7 million) in gross sales, with the average ticket price at about US$300 (EUR220). The Rolling Stones' tour ranked first.