A staff member has been arrested after he allegedly stabbed the principal of a school in Melbourne's south-east this afternoon.

Police swarmed Keysborough College about 3pm following reports of a stabbing.

The male staff member was arrested at the scene and will be interviewed by police.

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The principal was taken to hospital with non-life-threatening injuries.

He will also be interviewed by police.

The investigation remains ongoing. 

Anyone who witnessed the incident, has footage or any information that could assist police is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au