The body of missing Sydney man Patrick Hahn has been found on the lower north shore.

The 25-year-old disappeared in the early hours of Friday morning after a night out, and police and his family had appealed for the public to help find him.

Police found Patrick Hahn's body on Christmas Day at Hunters Hill. Credit:Facebook

His disappearance sparked a search, and about 2.45pm on Christmas Day police found a man's body in the water in Hunters Hill.

Police are yet to formally identify the body, but they believe it is Mr Hahn.