Pierre Mazeaud (born 24 August 1929 in Lyon) is a French jurist, politician and alpinist.
In February 2004, he was appointed president of the Constitutional Council of France by President of France Jacques Chirac, replacing Yves Guéna, until he was succeeded by Jean-Louis Debré in February 2007. He had been a member of the council since February 1998.
Pierre Mazeaud has a doctorate in law from the University of Paris (on marriage and the condition of the married woman in ancient Rome).
From 1961 to 1964, he was a member of the judiciary. In 1976, he became a counsellor in the Conseil d'État, a position from which he retired on 25 August 1995. During the 1970s, he held subordinate governmental positions regarding sports.
Pierre Mazeaud's main hobby is alpinism, which he practiced at high level. On 11 July 1961, Mazeaud and other fellow climbers almost died in the Mont Blanc massif due to an unexpected storm.
On 15 October 1978 he became the first Frenchman to climb Mount Everest together with Jean Afanassieff, Nicolas Jaeger and Kurt Diemberger (from Austria).