The 2017–18 Liga IV was the 76th 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 playoff to gain promotion. From this season the counties were divided into 7 regions, each consisting of 6 counties and the draw was made on 28 February 2018, with 3 months and a half before the first matches. Promotion play-off The matches are scheduled to be played on 16, 23 and 30 June 2018. |- |colspan="3" style="background-color:#97DEFF"|Region 1 (North-East) |colspan="2" style="background-color:#97DEFF"| ||0–1||0–1 ||w/o||w/o ||5–0||1–0 |- |colspan="3" style="background-color:#97DEFF"|Region 2 (North-West) |colspan="2" style="background-color:#97DEFF"| ||0–0||2–0 ||6–0||4–2 ||w/o||w/o |- |colspan="3" style="background-color:#97DEFF"|Region 3 (Center) |colspan="2" style="background-color:#97DEFF"| ||1–0||2–0 ||w/o||w/o ||2–0||1–3 |- |colspan="3" style="background-color:#97DEFF"|Region 4 (West) |colspan="2" style="background-color:#97DEFF"| ||0–1||2–1 ||4–0||3–0 (forfait) ||5–0||6–0 |- |colspan="3" style="background-color:#97DEFF"|Region 5 (South-West) |colspan="2" style="background-color:#97DEFF"| ||8–0||1–0 ||2–1||1–0 ||w/o||w/o |- |colspan="3" style="background-color:#97DEFF"|Region 6 (South) |colspan="2" style="background-color:#97DEFF"| ||1–1||2–4 ||0–7||1–10 ||5–1||1–1 |- |colspan="3" style="background-color:#97DEFF"|Region 7 (South-East) |colspan="2" style="background-color:#97DEFF"| ||2–2||0–3 ||0–3||1–5 ||0–4||4–3 |} County leagues Alba County Arad County Argeș County Bacău County Bihor County Bistrița-Năsăud County Botoșani County Brașov County Brăila County Championship play-off The teams started the championship play-off with half of the points accumulated in the regular season. Championship play-out The teams started the championship play-out with half of the points accumulated in the regular season. Bucharest Regular season Championship play-off The championship play-off played in a single round-robin tournament between the best four teams of the regular season. The teams started the play-off with the following points: 1st place – 3 points, 2nd place – 2 points, 3rd place – 1 point, 4th place – 0 points. Buzău County Relegation play-off The 14th and 15th-placed teams of Liga IV Buzău faces the 2nd-placed teams in the two series of Liga V Buzău. Caraș-Severin County Călărași County Cluj County Constanța County Covasna County Dâmbovița County Dolj County Championship play-off At the end of the regular season, the first four teams will play a Championship play-off and the winners crowned as county champions and qualify to the promotion play-off to Liga III. The teams will start the play-off with the number of points gained in the regular season only against the other qualified teams. League Cup The teams which was ranked 5th to 12th places in the regular season played in the League Cup to establish the final standings. In the League Cup, each tie was played on a