Pierre Victor de Chastonay (20 June 1931 – 14 September 2026) was a Swiss politician of the Christian Democratic Party (PDC).
The son of politician and Marcelle de Chastenay (née Wolff), he earned a licentiate in law from the University of Geneva and also took classes at the Centre européen universitaire de Nancy. He married Maria Pia Valenti in 1961 and had a daughter.
De Chastonay served in the Grand Council of Valais from 1969 to 1977 and was a member of the National Council from 1975 to 1987. He also chaired the Pro Rawyl association.
De Chastonay died on 14 September 2026, at the age of 95.
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