The 1965–66 Divizia C was the 10th season of Liga III, the third tier of the Romanian football league system.
[1] The format has been maintained to four series, each of them having 14 teams.
At the end of the season the winners of the series promoted to Divizia B and the last two places from each series relegated to Regional Championship.
[2] Relegated from Divizia B Promoted from Regional Championship Promoted to Divizia B Relegated to Regional Championship
Victoria Piatra Neamț was moved from Piatra Neamț to Roman and renamed as Victoria Roman.