The background to the case is allegations that Trump raped Carroll in a dressing room at a department store in the mid-1990s.
In a verdict in May 2023, a court ruled that Carroll could not prove that Trump had raped her, but that she had proven that he had committed sexual assault. The jury also found Trump guilty of defamation, after claiming that her statement was a lie fabricated to sell books.
Since it was a civil lawsuit and not a criminal case, Trump could not be sentenced to imprisonment.
The verdict was upheld by a panel of three judges in an appeals court in New York on Monday. Neither Trump's nor Carroll's lawyers have commented on the verdict, according to Reuters' website.
In another verdict in January this year in New York, Donald Trump was ordered to pay $83.3 million, nearly 900 million kronor, for defaming Carroll. That verdict has also been appealed by Trump.
The US Supreme Court ruled in 1997 in a case involving former President Bill Clinton that a sitting president does not have immunity in civil lawsuits regarding events dated before their official term as president.