| Election Name: | 1906 Westland by-election |
| Country: | New Zealand |
| Flag Year: | 1906 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1905 New Zealand general election |
| Previous Year: | 1905 general |
| Next Election: | 1908 New Zealand general election |
| Next Year: | 1908 general |
| Turnout: | 91.12% |
| Candidate1: | Tom Seddon |
| Party1: | New Zealand Liberal Party |
| Popular Vote1: | 2,403 |
| Percentage1: | 58.81 |
| Candidate2: | Henry Michel |
| Party2: | Conservative (New Zealand) |
| Popular Vote2: | 1,683 |
| Percentage2: | 41.18 |
| Member | |
| Before Election: | Richard Seddon |
| After Election: | Tom Seddon |
| Before Party: | New Zealand Liberal Party |
| After Party: | New Zealand Liberal Party |
The Westland by-election was a by-election in the New Zealand electorate of Westland, a semi-urban seat at the west coast of the South Island.
The by-election was held on 13 July 1906, and was precipitated by the death of sitting MP, Prime Minister Richard Seddon. The seat was won by his son, Thomas. His sole opponent was Henry Michel, former Mayor of Hokitika.[1]
The following table gives the election results: