The 2025–26 Thai League 3 Northeastern Region was part of the 2025–26 Thai League 3 Regional Stage, consisting of 12 clubs located in the northeastern region (Isan) of Thailand. The season commenced on 13 September 2025, with clubs competing in a round-robin format featuring home-and-away matches. The Regional Stage concluded on 22 March 2026, with the top two clubs advancing to the National Championship Stage, while the bottom-placed club was relegated to the Thailand Semi-pro League for the following season.

Seasonal Changes The 2025–26 Thai League 3 season features a number of changes compared to the previous campaign. These include the promotion and relegation of clubs between divisions, several club renamings and rebrandings, and the introduction of a new title sponsor, BYD Auto, which rebranded the competition as the BYD Dolphin League III for sponsorship reasons.

Promotions from Thailand Semi-pro League Normally, the champions of each of the six regional groups of the 2025 Thailand Semi-pro League would be promoted to the Thai League 3. However, in the Western region, the champions, The Wall, failed club licensing and were denied promotion. As a result, only five regional champions earned direct promotion, with several additional clubs promoted under special quotas due to licensing issues and adjustments to balance the number of teams in each group. Clubs promotion in the Northeastern region: Udon Banjan United – promoted as regional champions. EUMT – promoted as runners-up under a special quota, as the group expanded from 11 to 12 teams. In addition, relegated side Khon Kaen Mordindang were reprieved due to Rasisalai United's promotion to Thai League 2.

Promotion to Thai League 2 Rasisalai United, the 2024–25 national champion, earned promotion to Thai League 2, representing a significant loss of a strong competitor for the region. As a result, no club was relegated from the Thai League 3 Northeastern region, as the bottom-placed side was allowed to remain for balance.

Sponsorship and Broadcasting In the 2025–26 season, Thai League 3 will operate under a title sponsorship arrangement for the first time: BYD Auto (through BYD Rêver Thailand) has become the main sponsor for all three professional tiers in Thailand, including Thai League 3, rebranding it as the BYD Dolphin League III.

On the broadcasting side, a landmark media rights deal was struck, giving AIS Play (in partnership with Gulf and JAS) exclusive rights to stream all matches from Thai Leagues 1, 2, and 3, plus domestic cups and youth competitions for the 2025–26 through 2028–29 seasons. Under this agreement, Thai League 3 matches can be watched live for free via AIS Play, and fans will no longer rely solely on individual clubs' streaming efforts (e.g., via YouTube or Facebook), as they did in previous seasons.

Club name and logo changes 2 clubs have rebranded or changed their logos for the 2025–26 season of the Thai League 3 Northeastern region: Korat City, formerly known as Suranaree Black Cat, underwent a rebranding before the 2025–26 Thai League 3 season. The change included both a new club name and a redesigned crest. The previous emblem, which featured a stylized black cat head in a minimalist design, was replaced with a modern shield-shaped logo that displays a grey cat head with a fierce expression under the banner Wonder Cat Korat City. Udon United, introduced a new crest ahead of the 2025–26 season. The previous logo featured a fox head design with white markings on the mouth and eyebrows on a bright yellow background. It was replaced with a simplified version that retains the fox head motif but with darker tones and a deeper yellow background, while maintaining the inscription "Since 2018" at the bottom of the shield.

Teams Number of teams by province

PositionProvinceNumberTeams12Khon Kaen and Khon Kaen Mordindang2Surin City and Surin Khong Chee Mool2EUMT and Ubon Kruanapat2Udon Banjan United and Udon United51Muang Loei United1Korat City1Roi Et PB United1Yasothon

Stadiums and locations

Team Location Stadium CoordinatesUMT StadiumKhon Kaen PAO. StadiumStadium of Khon Kaen UniversityStadium of Nakhon Ratchasima Rajabhat UniversityLoei Provincial StadiumRoi Et Provincial StadiumSri Narong StadiumStadium of Rajamangala University of Technology Isan, Surin CampusStadium of Ubon Ratchathani Rajabhat UniversityStadium of Thailand National Sports University, Udon Thani CampusStadium of Thailand National Sports University, Udon Thani CampusYasothon PAO. Stadium

Road travel distances between clubs Road travel distances between clubs in the 2025–26 Thai League 3 Northeastern Region are approximate and calculated using the most practical and shortest accessible road routes. These measurements emphasize travel paths that balance directness and convenience, reflecting realistic journeys teams are expected to take throughout the season. By prioritizing usable road infrastructure and typical travel patterns in northeastern Thailand, the chart provides meaningful insight into the logistical demands of away fixtures.

Among all distances assessed, the shortest is 0 kilometers, representing Udon Banjan United and Udon United, who share the same home stadium and therefore require no travel between them. In contrast, the longest road trip spans 489 kilometers, marking the journey between Muang Loei United and Ubon Kruanapat. Regarding total seasonal travel, Muang Loei United faces the greatest cumulative distance, covering approximately 3,581 kilometers, while Roi Et PB United undertakes the least travel, totaling around 2,008 kilometers. These figures are summarized in the accompanying table, offering a detailed overview of the travel requirements encountered by clubs during the 2025–26 campaign.

FromTo (km)TotalEUMKKNKKMKRCMLUREUSRCKCMUBKUDBUDUYSTEUMT—2842913514881701711793407407992,850Khon Kaen284—91872121192292382831291291922,011Khon Kaen Mordindang2919—1942091252362442971221221962,045Korat City351187194—3332481741773563143142742,922Muang Loei United488212209333—3244184264891471473883,581Roi Et PB United170119125248324—150152171239239712,008Surin City171229236174418150—41733663661412,428Surin Khong Chee Mool1792382441774261524—1813733731442,491Ubon Kruanapat3283297356489171173181—4084081002,869Udon Banjan United407129122314147239366373408—03072,812Udon United4071291223141472393663734080—3072,812Yasothon9919219627438871141144100307307—2,219

Foreign players A T3 team could register 3 foreign players from foreign players all around the world. A team can use 3 foreign players on the field in each game. Note :: players who released during second leg transfer window;: players who registered during second leg transfer window. {|class="unsortable" |- | style="width:15px; background:#FFF2A8;"| ||AFC member countries players. |- | style="width:15px; background:#E3FFD0;"| ||CAF member countries players. |- | style="width:15px; background:#FFE0C6;"| ||CONCACAF member countries players. |- | style="width:15px; background:#D4E6FF;"| ||CONMEBOL member countries players. |- | style="width:15px; background:#CFFFEF;"| ||OFC member countries players. |- | style="width:15px; background:#F0E2FF;"| ||UEFA member countries players. |- | style="width:15px; background:#c8ccd1;"| ||No foreign player registered.

ClubLegPlayer 1Player 2Player 3EUMT1st2ndKhon Kaen1st2ndKhon Kaen Mordindang1st2ndKorat City1st2ndMuang Loei United1st2ndRoi Et PB United1st2ndSurin City1st2ndSurin Khong Chee Mool1st2ndUbon Kruanapat1st2ndUdon Banjan United1st2ndUdon United1st2ndYasothon1st2nd

League table Standings

Positions by round

Results by round

Results

References

External links Official website of Thai League