2020 K League 1
| Season | 2020 |
|---|---|
| Dates | 8 May – 1 November 2020 |
| Champions | Jeonbuk Hyundai Motors (8th title) |
| Relegated | Sangju Sangmu Busan IPark |
| Champions League | Jeonbuk Hyundai Motors Ulsan Hyundai Pohang Steelers Daegu FC |
| Matches played | 162 |
| Goals scored | 425 (2.62 per match) |
| Best Player | Son Jun-ho |
| Top goalscorer | Júnior Negrão (26 goals) |
| Biggest home win | Daegu 6–0 Seoul (14 June 2020) |
| Biggest away win | Seongnam 0–6 Incheon (27 September 2020) |
| Highest scoring | Daegu 4–6 Gwangju (30 August 2020) |
| Longest winning run | 5 matches Jeonbuk Hyundai Motors Ulsan Hyundai |
| Longest unbeaten run | 11 matches Ulsan Hyundai |
| Longest winless run | 15 matches Incheon United |
| Longest losing run | 8 matches Incheon United |
← 2019 2021 → | |
The 2020 K League 1 was the 38th season of the top division of professional football in South Korea, and the eighth season of the K League 1. Jeonbuk Hyundai Motors won their eighth title, becoming the most successful K League club which had the most titles.
The regular season was scheduled to begin on 29 February and to end on 4 October, but was postponed until 8 May due to the COVID-19 pandemic.
On 24 April 2020, the K League Federation confirmed that they would adopt a modified plan for the season, reducing the number of matchdays to 27 including five matchdays of each divided final league.
Sangju Sangmu and the lowest-placed team at the end of the season were relegated to the K League 2 for the 2021 season.
In this season, one additional spot for players from ASEAN countries was added regardless of the "3+1" foreign players rule.