1980 King Cup
The 1980 King Cup was the 22nd season of the knockout competition since its establishment in 1956. Al-Ahli were the defending champions but were eliminated by Ohod in the Round of 32. Al-Hilal defeated city rivals Al-Shabab to win their 3rd title and first since 1964.
Round of 32
The matches of the Round of 32 were held on 12, 13 and 14 April 1980.| Home team | Score | Away team |
| Al-Noor | 3–1 | Al-Anwar |
| Al-Riyadh | 4–1 | Al-Thoqbah |
| Al-Ansar | 1–2 | Al-Shabab |
| Al-Jabalain | 0–2 | Al-Ettifaq |
| Al-Kawkab | 3–2 | Al-Raed |
| Al-Khaleej | N/A | Al-Rabe'e |
| Al-Faisaly | 3–2 | Al-Taqadom |
| Al-Ittihad | 1–0 | Al-Nahda |
| Al-Hilal | 2–0 | Al-Taawoun |
| Ohod | 1–0 | Al-Ahli |
| Al-Tai | 1–3 | Al-Nassr |
| Al-Qadsiah | 5–2 | Okaz |
| Al-Rawdhah | 1–0 | Hajer |
| Al-Qala | 1–0 | Al-Watan |
| Al-Wehda | 4–0 | Al-Nojoom |
| Al-Washm | N/A | Damac |
Round of 16
The Round of 16 matches were held on 17 and 18 April 1980.| Home team | Score | Away team |
| Al-Ittihad | 1–0 | Al-Nassr |
| Al-Shabab | 4–0 | Al-Ettifaq |
| Al-Kawkab | 0–3 | Al-Qadsiah |
| Al-Khaleej | 4–3 | Al-Noor |
| Al-Hilal | 4–1 | Al-Wehda |
| Al-Riyadh | 3–1 | Damac |
| Al-Rawdhah | 1–2 | Al-Qala |
| Ohod | 7–1 | Al-Faisaly |
Quarter-finals
The Quarter-final matches were held on 21 and 22 April 1980.| Home team | Score | Away team |
| Al-Shabab | 3–2 | Al-Qadsiah |
| Al-Khaleej | 1–2 | Ohod |
| Al-Ittihad | 9–0 | Al-Qala |
| Al-Hilal | 3–0 | Al-Riyadh |