This is not the Gay Ghost of comic book fame. If you are looking for him then the Toonopedia entry is probably what you are look for.
No, these are genuine, 'queer ghosts', or at least they are to be found in various gay establishments
King Edward II and Piers Gaveston
The king and Piers were gay lovers. However, Edward's father, Edward I, was not happy with their relationship and had Piers banished. But in 1312, Piers returned to England. He was hunted down, and at Scarborough Castle, where his headless ghost can sometimes be seen, he was stabbed with a sword and beheaded.
King Edward II, didn't fare much better. He reigned until 1327, when he was forced to relinquish his crown in favour of his 14 year old son. He was then tortured and finally murdered at Berkeley Castle. It is said that his ghostly screams can be heard there on 21st September, the anniversary of his death.
King William VI, Hampstead
Another 'straight' ghost but in a 'gay' location! As London's oldest gay pub, it would be fitting if the King William VI was haunted by a gay phantom.
Alas, it is 'only' the spectre of a Mrs. Wyatt, who was killed by her husband and who's body was buried in the pub cellar. A recent visit to the pub by Derek Acorah allegedly uncovered all sorts of information about the cause of the haunting
Elephant and Castle, Amersham, Buckinghamshire
There is circumstantial evidence that the phantom haunting the Elephant and Castle pub, could be gay. The figure of a woman dressed all in black who has been seen by members of the landlady's family walking through walls near the pub's kitchens. And it is her spectre who is blamed for the unseen presence which has been known to pinch the bottom of the barmaids who work in the pub.