Three men are fighting for life after a stabbing in Western Sydney.

Police said the trio, aged 30, 37, and 56, were involved in an altercation just before 3.30pm in Girraween.

The 30-year-old and 56-year-old suffered several stab wounds to their torso, while the 37-year-old man suffered injuries to his arms.

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All of the men are believed to be known to each other.

Paramedics treated all three men before they were taken to hospital in a critical condition.

A crime scene has been established, with police investigating the fight.

Anyone who witnessed it or has footage is urged to contact police.

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