NSW chief justice criticises Tony Abbott's comments on Sydney Harbour Bridge protest. By Alexander Lewis, ABC

The New South Wales chief justice has criticised Tony Abbott's "misconceived" comments on a judge's decision to approve a pro-Palestinian march on the Sydney Harbour Bridge.

The former prime minister said it should not be for judges to decide when a political protest was justified, in a social media post following Justice Belinda Rigg's ruling last August.

In a speech to the legal profession on Thursday night, Chief Justice Andrew Bell said Mr Abbott's remarks were regrettable.

The chief justice said Justice Rigg's decision was not about whether a political protest was justified, as would have been clear "to anyone who took the time to read it".

"This comment was, with respect, misconceived," Chief Justice Bell said.

NSW chief justice criticises Tony Abbott's comments on Sydney Harbour Bridge protest. By Alexander Lewis, ABC