A French secret service report, printed by a newspaper, said that Saudi Arabia is convinced the al-Qaeda leader died of typhoid in Pakistan last month.
But the Saudi embassy in Washington said the kingdom had no evidence to support the media report.
“Information that has been reported otherwise is purely speculative and cannot be independently verified," the embassy said.
French Foreign Minister Philippe Douste-Blazy said as far as he knew bin Laden was still alive.
"To my knowledge Osama bin Laden is not dead," he said on LCI Television.
But he added he had not seen the report in French regional daily L'Est Republicain, which quoted the DGSE foreign intelligence service.
France, the US and Britain all said earlier they were unable to confirm the report.
Time magazine separately posted an article on its website quoting an unidentified Saudi source that said bin Laden was stricken with a water-borne disease and may already be dead.
World leaders deny claim
French President Jacques Chirac told reporters bin Laden's death "has not been confirmed in any way whatsoever and so I have no comment to make".
Mr Chirac said he was also surprised a confidential note had been published. France has launched an investigation into the leak.
US Secretary of State Condoleezza Rice was also tight lipped when questioned by reporters in New York about the French article. "No comment, no knowledge," she said.
British Prime Minister Tony Blair, asked in a BBC interview if he could shed light on the report, said: "No, I can't. I haven't heard anything that indicates that might be the case."
A US intelligence source said Washington, which wants to capture bin Laden, had no evidence the report was any more credible than earlier rumours of his death.
"We've heard these things before and have no reason to think this is any different," said the US intelligence official, who asked not to be named.
Leaked report
L'Est Republicain, published in Nancy, printed what it said was a copy of the DGSE report, dated September 21, and said it was passed to Chirac and Prime Minister Dominique de Villepin the same day.
"According to a usually reliable source, the Saudi services are now convinced that Osama bin Laden is dead," it read.
"The information gathered by the Saudis indicates that the head of al-Qaeda fell victim, while he was in Pakistan on August 23, 2006 to a very serious case of typhoid that led to a partial paralysis of his internal organs."