The 1966–67 Divizia C was the 11th season of Liga III, the third tier of the Romanian football league system. 
The format was maintained with four series, each consisting of 14 teams. At the end of the season, the winners of each series were promoted to Divizia B, while the bottom two teams from each series were relegated to the Regional Championship. By topping their respective groups, Victoria Roman, Portul Constanța, Metalul Hunedoara, and Olimpia Oradea secured promotion to 1967–68 Divizia B.
Team changes.
To Divizia C.
Relegated from Divizia B
Promoted from Regional Championship
From Divizia C.
Promoted to Divizia B
Relegated to Regional Championship
Renamed teams.
"AS Aiud" was renamed Metalul Aiud.
"Minerul Deva" was renamed Mureșul Deva.
"Progresul Reghin" was renamed Voința Reghin.
"Metalosport Galați" was renamed Gloria CFR Galați.
"Tehnometal București" was renamed Rapid CF București.
"Fructexport Focșani" was renamed Unirea Focșani.