The 1887 Port Chalmers by-election was a by-election held on 6 April 1887 in the Port Chalmers electorate during the 9th New Zealand Parliament.
The by-election was caused by the death on 11 February of the incumbent MP James Macandrew.
The by-election was won by James Mills.
As he was the only candidate nominated, he was declared duly elected.
This New Zealand election-related article is a stub.