1979–80 FA Cup Third round proper Third round proper

| Tie_no | Home_team | Score | Away_team | Date_ |
|---|---|---|---|---|
| 29 | Chesham United | 0–2 | Cambridge United | 5 January 1980 |
| 30 | Leeds United | 1–4 | Nottingham Forest | 5 January 1980 |
| 31 | Birmingham City | 2–1 | Southampton | 5 January 1980 |
| 32 | Swansea City | 2–2 | Crystal Palace | 5 January 1980 |
| Replay | Crystal Palace | 3–3 | Swansea City | 8 January 1980 |
| Replay | Swansea City | 2–1 | Crystal Palace | 14 January 1980 |