Police responded to reports of about 10 people fighting inside a venue in the heart of Ballarat CBD about 10pm.

According to police, the fight broke out inside a venue but security guards had moved all of those involved on to the street before police officers arrived at the scene.

Ambulance Victoria paramedics were called to the incident and treated a 29-year-old male.

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Paramedics took the male, who had upper body injuries, to Ballarat Base Hospital in a "serious but stable condition".

Police said the exact circumstances surrounding the incident were being investigated.

Nobody has yet been charged.

Police asked anyone with information to contact Crime Stoppers on 1800 333 000 or make a report online at www.crimestoppersvic.com.au

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