The Belfast South by-election of 22 October 1963 was held after the death of Ulster Unionist Party Member of Parliament (MP) Sir David Campbell on 12 June the same year. The seat was retained by the Ulster Unionists.
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Ulster Unionist | Rafton Pounder | 17,989 | 64.3 | -5.6 | |
| NI Labour | Norman Searight | 7,209 | 25.8 | +4.2 | |
| Ulster Liberal | Albert Hamilton | 2,774 | 9.9 | +2.4 | |
| Majority | 10,780 | 38.5 | -9.8 | ||
| Turnout | 27,972 | 48.3 | -23.8 | ||
| Registered electors | 57,864 | ||||
| Ulster Unionist hold | Swing | ||||