An outspoken critic and former church member was arrested for trespassing at Hillsong's national conference in Sydney Olympic Park on Tuesday.

Tanya Levin, 43, was banned by church management in 2005 from attending any Hillsong events or setting foot on Hillsong premises.

Tanya Levin was arrested outside a Hillsong conference. Credit:Marco Del Grande MDG

But she assumed she was on safe ground when a reporter from Channel Nine's A Current Affair invited her to be interviewed outside the Allphones Arena at Sydney Olympic Park while the megachurch's conference took place inside.

During the interview Ms Levin was approached by two police officers who told her she was trespassing and would be fined if she did not move on.