Police are trying to get CCTV footage of an assault on Wellington's Cuba St that left a young man with serious injuries. (File photo)

Police are looking for witnesses to an alleged late night assault on Wellington's Cuba St that left a young man in hospital with serious injuries.

A police spokeswoman said officers responded to multiple calls about a group fighting on Cuba Street, near Vivian Street, at about 1.25am on Sunday.

One man in his 20s was seriously injured and taken to Wellington Hospital in an ambulance.

Police arrested a man - also in his 20s - at the scene and spoke to a number of witnesses.

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The alleged attacker has since been charged with assault with intent to injure and is due to appear in Wellington District Court.

Police were trying to get CCTV footage of the assault and were still collecting witness statements and making ongoing inquiries.

*Anyone with information should contact Wellington Police on (04) 381 2000 or Crimestoppers on 0800 555 111.