The 1972–73 County Championship was the 31st season of the Liga IV, the fourth tier of the Romanian football league system.
The promotion play-off was not held this season, due to the expansion of Divizia C from next season, from twelve series with 14 teams to twelve series of 16 teams.
The matches was played on 9 and 16 June 1973.
CFR Caransebeș won the Caraș-Severin County Championship and promoted to Divizia C. The matches was played on 3 and 10 June 1973.
CFR Craiova won the Dolj County Championship and promoted to Divizia C. Dacia Orăștie won the Hunedoara County Championship and promoted to Divizia C.