K League 1
| Organising body | K League Federation |
|---|---|
| Founded | 1983 |
| Country | South Korea |
| Confederation | AFC |
| Number of clubs | 12 |
| Level on pyramid | 1 |
| Relegation to | K League 2 |
| Domestic cup(s) | Korean FA Cup |
| International cup(s) | AFC Champions League Elite AFC Champions League Two |
| Current champions | Ulsan HD (5th title) (2024) |
| Most championships | Jeonbuk Hyundai Motors (9 titles) |
| Broadcaster(s) | JTBC Golf&Sports IB Sports Sky Sports (South Korea) Coupang Play Next Level Sports |
| Website | kleague.com |
| Current: 2025 K League 1 | |
| K League 1 | |
| Hangul | K리그 원 |
|---|---|
| Revised Romanization | K rigeu one |
| McCune–Reischauer | K rigŭ wŏn |
The K League 1 (Korean: K리그1) is a professional association football league in South Korea and the highest level of the South Korean football league system. The league is contested by twelve clubs. It is one of the most successful leagues in the Asian Football Confederation, with its past and present clubs having won a record twelve AFC Champions League titles.