Police will oppose the use of the Sydney Opera House forecourt for a massive anti-Israel protest only days after the second anniversary of the October 7 Hamas attacks.

A Palestine support group has applied to hold a rally for 10,000 people on October 12 starting in Hyde Park and tracking through the inner city to the iconic building's forecourt.

NSW Police have taken legal action in the Supreme Court to stop the gathering at the famous site, citing safety concerns about the number of people who may attend and the potential for "crowd crush".

"We understand that this is a significant anniversary," Assistant Commissioner Peter McKenna told reporters on Friday.

"We aren't anti-protest ... it's about public safety.

"The Opera House has its own (regulations) and engineering requirements wh

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