Kennedy on Wednesday denied without comment an appeal by Philip J. Berg, a Pennsylvania attorney, that claims Obama is either a citizen of Kenya or Indonesia and is ineligible to be president because he is not a "natural-born citizen" of the U.S. as required by the Constitution.
Another appeal from California, based on Berg's claims, also was denied.
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Individual justices and the entire court have turned down emergency appeals over Obama's eligibility at least seven times in the past six weeks.
Obama was born in Hawaii in 1961 to an American mother and a Kenyan father.
Reacting to Internet-fueled conspiracy theories that Obama's birth certificate is a fake, Hawaiian officials have said they examined the document and have no doubt it is authentic.
On the site he insists that President-elect Obama is not a natural born citizen.