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| Season | 2018 |
|---|---|
| Champions | Final stage JL Chiangmai United Regional stage JL Chiangmai United (Upper Region) MOF Customs United (Lower Region) |
| Promoted | JL Chiangmai United MOF Customs United Ayutthaya United |
| Relegated | Kalasin (Upper Region) Deffo (Lower Region) |
| Matches played | 368 |
| Goals scored | 919 (2.5 per match) |
| Top goalscorer |  Chatchai Narkwijit(20 Goals) |
| Biggest home win | 7 goals difference Nara United 7–0 Simork (5 August 2018) |
| Biggest away win | 5 goals difference Bangkok 1–6 Chachoengsao Hi-Tek (7 July 2018) |
| Highest scoring | 8 goals Simork 3–5 MOF Customs United (26 August 2018) |
| Longest winning run | 6 matches JL Chiangmai United (2 matches from final) |
| Longest unbeaten run | 23 matches JL Chiangmai United (2 matches from final) |
| Longest winless run | 13 matches Kalasin |
| Longest losing run | 5 matches BTU United Kalasin Kamphaengphet Muangkan United Royal Thai Army Surat Thani |
| Highest attendance | 3,116 Chachoengsao Hi-Tek 2–0 Muangkan United (19 August 2018) |
| Lowest attendance | 30 Chiangrai City 1–1 Muangkan United (30 June 2018) Chiangrai City 0–0 Kalasin (28 July 2018) |
| Total attendance | 146,747 |
| Average attendance | 401 |
← 2017 2019 → | |
The 2018 Thai League 3 (known as the Omsin League Pro for sponsorship reasons) football season will be the second season of Thai League 3. 31 clubs will be divided into 2 groups (regions).