2021–22 Thai League 3 National Championship
# 2021–22 Thai League 3 National Championship

The National Championship was the next stage from the regional stage of 2021–22 Thai League 3. The winners and runners-ups of each region would qualify for this round to find 3 clubs promoting to 2022–23 Thai League 2.

## Teams

| Team | Qualifying method |
| - | - |
| Uthai Thani | Northern region champions |
| Phitsanulok | Northern region runners-up |
| Muang Loei United | Northeastern region champions |
| Sisaket | Northeastern region runners-up |
| Pattaya Dolphins United | Eastern region champions |
| Chachoengsao Hi-Tek | Eastern region runners-up |
| Saraburi United | Western region champions |
| Pathumthani University | Western region runners-up |
| Krabi | Southern region champions |
| Nakhon Si United | Southern region runners-up |
| North Bangkok University | Bangkok Metropolitan region champions |
| Bangkok | Bangkok Metropolitan region runners-up |

## Group stage

### Upper region

| Pos | Team | Pld | W | D | L | GF | GA | GD | Pts | Qualification | UTT | PLK | PAT | MLU | SKT | CCH |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 1 | Uthai Thani (C, P) | 5 | 4 | 0 | 1 | 14 | 6 | +8 | 12 | Qualification to the final and promotion to the 2022–23 Thai League 2 | — | — | 4–1 | — | 6–2 | 3–1 |
| 2 | Phitsanulok | 5 | 4 | 0 | 1 | 9 | 4 | +5 | 12 | Qualification to the third place play-off | 2–0 | — | — | — | — | 3–1 |
| 3 | Pattaya Dolphins United | 5 | 4 | 0 | 1 | 11 | 8 | +3 | 12 | | — | 2–0 | — | 2–1 | 4–3 | — |
| 4 | Muang Loei United | 5 | 1 | 0 | 4 | 5 | 7 | −2 | 3 | | 0–1 | 0–1 | — | — | 2–0 | — |
| 5 | Sisaket | 5 | 1 | 0 | 4 | 8 | 15 | −7 | 3 | | — | 1–3 | — | — | — | 2–0 |
| 6 | Chachoengsao Hi-Tek | 5 | 1 | 0 | 4 | 5 | 12 | −7 | 3 | | — | — | 0–2 | 3–2 | — | — |

* 1 2 3 The head-to-head points record (mini-league); Uthai Thani 3 pts (GD +1), Phitsanulok 3 pts (GD 0), Pattaya Dolphins United 3 pts (GD -1).
* 1 2 3 The head-to-head points record (mini-league); Muang Loei United 3 pts (GD +1), Sisaket 3 pts (GD 0), Chachoengsao Hi-Tek 3 pts (GD -1).

### Lower region

| Pos | Team | Pld | W | D | L | GF | GA | GD | Pts | Qualification | KBI | NSU | NBU | SRU | PTU | BKK |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 1 | Krabi (P) | 5 | 3 | 1 | 1 | 8 | 6 | +2 | 10 | Qualification to the final and promotion to the 2022–23 Thai League 2 | — | 0–0 | 2–1 | — | — | 1–2 |
| 2 | Nakhon Si United (O, P) | 5 | 2 | 3 | 0 | 9 | 2 | +7 | 9 | Qualification to the third place play-off | — | — | — | — | 3–0 | 5–1 |
| 3 | North Bangkok University | 5 | 2 | 2 | 1 | 5 | 2 | +3 | 8 | | — | 0–0 | — | 0–0 | — | 3–0 |
| 4 | Saraburi United | 5 | 2 | 2 | 1 | 6 | 5 | +1 | 8 | | 2–3 | 1–1 | — | — | 2–1 | — |
| 5 | Pathumthani University | 5 | 1 | 0 | 4 | 6 | 8 | −2 | 3 | | 1–2 | — | 0–1 | — | — | — |
| 6 | Bangkok | 5 | 1 | 0 | 4 | 3 | 14 | −11 | 3 | | — | — | — | 0–1 | 0–4 | — |

* 1 2 The head-to-head record was a tie, North Bangkok University ahead on overall goals difference.
* 1 2 Pathumthani University ahead on head-to-head points record; Pathumthani University 3 pts, Bangkok 0 pts.

## Knockout stage

Winners, runners-up, and third place of 2021–22 Thai League 3 would be promoted to the 2022–23 Thai League 2.

### Third place play-off

**Summary**

| Team 1 | Agg. | Team 2 | 1st leg | 2nd leg |
| - | - | - | - | - |
| Phitsanulok | 3–4 | Nakhon Si United | 1–1 | 2–3 |

**Matches**

Nakhon Si United won 4–3 on aggregate.

### Final

**Summary**

| Team 1 | Agg. | Team 2 | 1st leg | 2nd leg |
| - | - | - | - | - |
| Uthai Thani | 3–1 | Krabi | 2–0 | 1–1 |

**Matches**

Uthai Thani won 3–1 on aggregate.

## Teams promoted to 2022–23 Thai League 2

   * Uthai Thani (champions)

   * Krabi (runners-up)

   * Nakhon Si United (third-placed)
