Has Yoko Ono ever mentioned seeing John Lennon's ghost?

Not that I know of, but Julian Lennon (John's older son with his first wife, Cynthia) has told a story about a white feather that might interest you. read more

John Lennon’s Ghost On December 8, 1980 former beatle John Lennon and his wife Yoko Ono where just returning home to The Dakota, a luxury apartment building in Manhattan, when a deranged fan shot Lennon five times in the back near the entrance to the Dakota. read more

Before his death John Lennon told Cynthia that if there was life after death he would prove it by sending her and Julian Lennon a feather as a sign.” Paul McCartney expressed similar sentiments after Lennon’s death when he watched a white peacock wandered over from the neighbouring farm during a photo shoot. read more