Daily Mail has snapped photos of Harington filming in Belfast.
It adds to continued speculation that he will reappear in the series despite dying in the season 5 finale.
Harington has previously said, “The important thing is that I now know exactly how long I am still under contract.
“Let’s just say that Game of Thrones will remain a part of my life for a while, I’ll probably be in my thirties when it’s over.”
However HBO president Michael Lombardo also told journalists in July that “dead is dead is dead. He be dead.”