Another Labour MP has been referred to the Privileges Committee over criticism of Parliament's Speaker.

Port Hills MP Ruth Dyson is the latest to be referred - this time over criticism she made about Speaker David Carter via her Twitter account.

Deputy Speaker Chester Borrows has made the ruling after a complaint was lodged by National Party whip Tim MacIndoe

"It is for the privileges committee to determine whether the comments in this instance amount to contempt," the Deputy Speaker said.  

The ruling was greeted with audible dissent by Labour MPs in Parliament's debating chamber.