Notre Dame Cathedral Panorama, Cambodia

Notre Dame Cathedral, also known as the Cathedral of Phnom Penh (Khmer: រាជធានីភ្នំពេញវិហារ; French: Cathédrale de Phnom Penh), was a 19th-century French Gothic revival church that served as the cathedral of the Apostolic Vicariate of Phnom Penh. It was located in the Russei Keo District of the city on Monivong Boulevard.

The construction of the cathedral began in the 19th century and was overseen by the French colonial government in Cambodia. The architectural style has been described as resembling Reims Cathedral. Shortly after the Khmer Rouge conquered Phnom Penh at the end of the Cambodian Civil War, the cathedral was destroyed.