The 1964–65 FAW Welsh Cup is the 78th season of the annual knockout tournament for competitive football teams in Wales.
League name pointed after clubs name.
Ten winners from the Fourth round and six new clubs.
| width=50 | Tie no | width=250 | Home | width=50 | Score | width=250 | Away |
|---|---|---|---|---|---|---|---|
| 1 | Chester (FL D4) | 1–1 | Bangor City (CCL) | ||||
| replay | Bangor City (CCL) | 0–4 | Chester (FL D4) |
| width=50 | Tie no | width=250 | Home | width=50 | Score | width=250 | Away |
|---|---|---|---|---|---|---|---|
| 1 | Chester (FL D4) | 0–0 | Borough United (WLN) | ||||
| replay | Borough United (WLN) | 2–2 | Chester (FL D4) | ||||
| replay | Chester (FL D4) | 3–0 | Borough United (WLN) |
Cardiff City and Swansea Town played at Newport.
| width=50 | Tie no | width=250 | Home | width=50 | Score | width=250 | Away |
|---|---|---|---|---|---|---|---|
| 1 | Cardiff City (FL D2) | 1–0 | Swansea Town (FL D2) | ||||
| 2 | Wrexham (FL D4) | 3–1 | Chester (FL D4) |
Replay were held at Shrewsbury.
| width=50 | Tie no | width=250 | Home | width=50 | Score | width=250 | Away |
|---|---|---|---|---|---|---|---|
| 1 | Cardiff City (FL D2) | 5–1 | Wrexham (FL D4) | ||||
| Wrexham (FL D4) | 1–0 | Cardiff City (FL D2) | |||||
| replay | Cardiff City (FL D2) | 3–0 | Wrexham (FL D4) |