Bacon rashers have been strewn across Muslim prayer mats inside a southwest Sydney hospital.

A visitor to the public Muslim prayer room at Bankstown-Lidcombe hospital discovered the meat on this afternoon.

Social media user Hanan Dover captured the "horrible" act and posted it to Facebook.

"Horrible. Some anonymous bigot thought it would be appropriate to offend Muslims by placing bacon rashers on Muslim prayer mats inside the public prayer room at Bankstown Hospital," Mr Dover wrote.

"We are disappointed and we immediately arranged for the prayer mats to be professionally steam cleaned," acting general manager Linda Campbell said.

“We apologise for the offence caused and our staff have ensured that the prayer room is available for use."