1979–80 FA Cup Second Round Proper Second Round Proper

| Tie_no | Home_team | Score | Away_team | Date_ |
|---|---|---|---|---|
| 9 | Grimsby Town | 2–0 | Sheffield United | 15 December 1979 |
| 10 | Northwich Victoria | 2–2 | Wigan Athletic | 5 January 1980 |
| Replay | Wigan Athletic | 1–0 | Northwich Victoria | 7 January 1980 |
| 11 | Doncaster Rovers | 1–2 | Mansfield Town | 15 December 1979 |
| 12 | Tranmere Rovers | 2–2 | Rochdale | 15 December 1979 |
| Replay | Rochdale | 2–1 | Tranmere Rovers | 18 December 1979 |
| 13 | Carlisle United | 3–0 | Sheffield Wednesday | 15 December 1979 |
| 14 | Wimbledon | 0–0 | Portsmouth | 18 December 1979 |
| Replay | Portsmouth | 3–3 | Wimbledon | 24 December 1979 |
| Replay | Wimbledon | 0–1 | Portsmouth | 5 January 1980 |
| 15 | Southend United | 1–1 | Harlow Town | 15 December 1979 |
| Replay | Harlow Town | 1–0 | Southend United | 18 December 1979 |
| 16 | Chesham United | 1–1 | Merthyr Tydfil | 19 December 1979 |