The accident at Knock Eden Park just off Mount Merrion Avenue.
Detective Sergeant Dolores Black said: “It was reported to police at around 2.40am, that a man aged in his 30’s had been struck by a car, leaving him with serious but non-life threatening injuries.
“A man in his 50’s was arrested a short time later in relation to the incident and remains in custody helping with enquiries.
“I would appeal to anyone who was in the area of Knock Eden Park and who witnessed this incident or who has any information which may assist us with our enquiries to call detectives at Musgrave on 101.
“Information can also be passed anonymously through the independent charity Crimestoppers on 0800 555 111.”