A Supreme Court defamation case brought by halal certifier Mohamed El-Mouelhy against the far-right Q Society has been settled out of court, with the organisation, its board members and politician Kirralie Smith making an apology.

Mr El-Mouelhy, chairman of the Halal Certification Authority, brought defamation action against the Q Society and Ms Smith in early 2015, over two YouTube videos she presented on halal certification.

Kirralie Smith speaks at a Q Society fundraiser for her legal battle on February 9. Credit:Wolter Peeters

Ms Smith, who was a senate candidate for the Australian Liberty Alliance at the last federal election, is the face of the anti-halal campaign "Halal Choices".

Mr El-Mouelhy alleged the videos - both of which named him - portrayed him as "part of a conspiracy to destroy Western civilisation from within".