Who was the first Pm of Cambodia and Laos?

The first Prime Minister of Cambodia was Norodom Sihanouk, who served as Prime Minister from 1945 to 1955.

The first Prime Minister of Laos was Souvanna Phouma, who served as Prime Minister of the Kingdom of Laos from 1951 to 1952 and again from 1960 to 1962.