The 1977–78 County Championship was the 36th season of the Liga IV, the fourth tier of the Romanian football league system.
The champions of each county association play against one from a neighboring county in a play-off to gain promotion to Divizia C.Teams promoted to Divizia C without a play-off matches as teams from less represented counties in the third division.
The matches was played on 11 and 18 June 1978.
Victoria Ineu won the Arad County Championship and qualify for promotion play-off in Divizia C. Metalosport Galați won the Galați County Championship and qualify for promotion play-off in Divizia C. Mureșul Toplița won the Harghita County Championship and qualify for promotion play-off in Divizia C. The matches was played on 18 and 21 June 1978 at UMT Stadium in Timișoara.
ICRAL Timișoara won the Timiș County Championship and qualify for promotion play-off in Divizia C.