The Trefnydd, or Leader of the House in English, and formerly Minister for Assembly Business, is a member of the Cabinet in the Welsh Government, who manages the government's business in the Senedd (the Welsh Parliament; Welsh: Senedd Cymru; formerly the National Assembly for Wales).

The current officeholder is Jane Hutt since March 2024.

Minister for North Wales The post is responsible for organising government business in the Senedd.

[16] In May 2016, alongside the role of Chief Whip, the Leader of the House's responsibilities were:[17]