Template:New Zealand by-elections during the 31st Parliament
The following table contains the by-elections that have occurred during the term of the 31st Parliament.
| Electorate and by-election | Date | Incumbent | Cause | Winner | |||
|---|---|---|---|---|---|---|---|
| Riccarton | 1956 | 27 October | Angus McLagan | Death | Mick Connelly | ||
| Bay of Plenty | 1957 | 6 April | Bill Sullivan | Resignation | Percy Allen | ||