Prince Norodom Ranariddh (born January 2, 1944) is the second son of former king Norodom Sihanouk of Cambodia and a half-brother of the current king, Norodom Sihamoni.

Prince Norodom Ranariddh grew up in Phnom Penh and he lived in France for many years. He was appointed a lecturer in law at the University of Aix en Provence, and remains one of the world experts in aspects of maritime law. Until recently he still gave lectures at the university, even when he was Prime Minister.

For most of the period of the Vietnamese Occupation of Cambodia 1979-1989, Prince Ranariddh led the Royalist movement, FUNCINPEC. When the monarchy was restored in 1993, his political party won the elections, the first free elections since 1972. As such he is regarded by many Cambodians as the man who brought democracy back to the country. He became Prime Minister, but had to serve jointly with his father's rival Hun Sen who had lost the 1993 elections but wanted to hang onto power and insisted that he remained in the government. By agreement, the two first shared the title of Prime Minister with Ranariddh as First Prime Minister, while Hun Sen became Second Prime Minister. Prince Ranarddh tried to reform the country but was obstructed by Hun Sen. These differences came to a head in July 1997 when Rannaridh was ousted by Hun Sen in a bloody coup d'état which saw some of Prince Ranariddh's supporters being killed, and his house looted.