The 1960 BBC drama Colombe was lost to the archives until experts recently uncovered a copy in the U.S. Library of Congress.
In the footage Connery, then 29, plants a kiss on the lips of Richard Pasco, who plays his brother. Connery's character believes his sibling is having an affair with his wife and kisses him in a bid to understand why she has picked him as her lover.
Dick Fiddy, TV consultant at the British Film Institute, says, "Sadly nobody around here now seems to recall it. But it might have been accepted because of the context and because it was a television version of a classic play by a great French dramatist.
"It was, we are pretty sure, the first male-to-male kiss on TV, film or on stage."