The Ghost and Mrs. Muir- Gene Tierney, Rex Harrison-1947 IMDB 7.8/10

In 1900, strong-willed widow Lucy Muir (Gene Tierney) goes to live in Gull Cottage by the British seaside, even though it appears to be haunted. Sure enough, that very night she meets the ghost of crusty former owner Captain Daniel Gregg (Sir Rex Harrison), and refuses to be scared off. Indeed, they become friends and allies, after Lucy gets used to the idea of a man's ghost haunting her bedroom. But when a charming live man comes courting, Lucy and the Captain must deal with their feelings for each other.