Pierre Eugène Jean Pflimlin was a French Christian Democrat politician who served as the Prime Minister of the Fourth Republic for a few weeks in 1958, before being replaced by Charles de Gaulle during the crisis of that year.

The May 1958 crisis, also known as the Algiers putsch or the coup of 13 May, was a political crisis in France during the turmoil of the Algerian War of Independence (1954–1962) which led to the collapse of the Fourth Republic and its replacement by the Fifth Republic led by Charles de Gaulle who returned to power after a twelve-year absence. It started as a political uprising in Algiers on 13 May 1958 and then became a military coup d'état led by a coalition headed by Algiers deputy and reserve airborne officer Pierre Lagaillarde, French Generals Raoul Salan, Edmond Jouhaud, Jean Gracieux, and Jacques Massu, and by Admiral Philippe Auboyneau, commander of the Mediterranean fleet. The coup was supported by former Algerian Governor General Jacques Soustelle and his activist allies.