- Source: 1873 Mongonui and Bay of Islands by-election
- 1873 Mongonui and Bay of Islands by-election
- Mongonui and Bay of Islands (New Zealand electorate)
- 1873 Wakatipu by-election
- John McLeod (New Zealand politician)
- 1873 Invercargill by-election
- 1873 Waikouaiti by-election
- 1870 Mongonui by-election
- 1873 Lyttelton by-election
- 1858 Wairarapa and Hawke's Bay by-election
- 1873 Collingwood by-election
The 1873 Mongonui and Bay of Islands by-election was held on 24 July 1873 in the Mongonui and Bay of Islands electorate in Northland during the 5th New Zealand Parliament after the sitting member, John McLeod, resigned. The by-election was won by John William Williams.
John Macfarlane, one of the other candidates, denied that he had paid McLeod £200 to resign.