Pierre-Yves Maillard (born 16 March 1968)[1] is a Swiss politician of the Social Democratic Party. He was successively a deputy for the canton of Vaud on the National Council (from the end of 1999 to the end of 2004), a member of the Council of State of Vaud at the head of the department of health and social action (from the end of 2004 to May 2019), again national advisor (from the end of 2019 to the end of 2023) and advisor to the states since the end of 2023.