Police are investigating the circumstances of how a man sustained a head injury at a property on Dickson Street at Glenorchy around 11.30pm last night.

The 19-year-old man is in the Royal Hobart Hospital in a serious condition.

Anyone with information that may assist the investigation is asked to contact Glenorchy Police on 131 444 and quote OR769213.

Information can also be provided anonymously to Crime Stoppers Tasmania at crimestopperstas.com.au or on 1800 333 000.