Yes, in March 1962.
Marilyn met John F. Kennedy (officially) on only four confirmed occasions.
October 1961: Marilyn asked Allan Snyder, her friend and make-up artist, to take her to a party at Pat and Peter Lawford’s house in Santa Monica. Guests included Kim Novak and Angie Dickinson as well as the President of the United States. She was driven home by one of the Lawfords’ staff.
5th December 1961: JFK was in New York to make an address at the National Football Banquet and Hall of Fame held at the Waldorf-Astoria in New York City. It is reported that Marilyn met the President in New York City at the banquet. It is this night that is often connected to the “sex parties” which were thrown up in 1965.
However, it was impossible for Marilyn and the other participants to leave the ‘invite only’ party to sneak away for an orgy. This file was created by J. Edgar Hoover who was known to smear many reputations.
24th of March 1962: Marilyn and others including JFK had been invited to Bing Crosby’s home in Palm Springs along with other guests.
19th May 1962: As with Bobby, she was not taken home by either of them and spent almost the entire night with her former father-in-law Isidore Miller before being driven home.
These meetings, all mostly public, left no time for lurid affairs and government secret discussions.