Pourquoi Pas (English: Why not) may refer to:
- French ship Pourquoi Pas?, the name of several ships, including:
- Pourquoi-Pas (1908), the fourth ship built for Jean-Baptiste Charcot
- Pourquoi Pas? (2005), a research vessel built for IFREMER and the French Navy
- Pourquoi Pas Island, an island of Antarctica
- Pourquoi Pas Point, a headland of Antarctica
- Pourquoi pas!, a 1977 film