The actress - who is best known for her role as Princess Leia in three 'Star Wars' movies - has suggested she got very close to Ford while they were filming the sci-fi trilogy, after decades of rumours.
Appearing on forthcoming British TV show 'Bring back... Star Wars', she said: "I went on the film saying, 'I'm going to have an affair', like it was a kiwi, an exotic fruit - because I had never had one."
The 51-year-old actress added: "I'm going to get into so much trouble. Once, I left the room and came back and Harrison was in the closet not wearing a lot of clothes! I had a crush on Harrison for sure. Harrison is great fun when he has had a few drinks."
The three original 'Star Wars' films starring Fisher and Ford were made between 1977 and 1983.
Fisher has since become a top screenwriter, while Ford is one of the biggest stars in Hollywood history.
Fisher says this caused a degree of tension on set between Ford and leading man Mark Hamill, who played 'Star Wars' hero Luke Skywalker.
She said: "Harrison had this enormous career by the second or third film, that was tough for Mark Hamill. He was like, 'This wasn't supposed to happen - it's the adventures of Luke Skywalker'."
Ford stars in 'Indiana Jones and the Kingdom of the Crystal Skull', which opens at cinemas worldwide this summer.
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