The 1990–91 Divizia C was the 35th season of Liga III, the third tier of the Romanian football league system.
[1] Relegated from Divizia B Promoted from County Championship Promoted to Divizia B Relegated to County Championship
ASA Chimia Ploiești was renamed as Chimia Brazi Ploiești.
Chimia Victoria Turnu Măgurele was renamed as Chimia Turnu Măgurele Dacia Orăștie merged with Dacia Mecanica Orăștie and changed its name to Metaloplastica Orăștie.
Carpați Mârșa became Textila Cisnădie.