The 1887 St Austell by-election was a by-election held on 18 May 1887 for the British House of Commons constituencyofSt AustellinCornwall.
The by-election was triggered by the resignation of the serving Liberal Party Member of Parliament (MP), William Copeland Borlase. It was retained by the Liberal candidate William Alexander McArthur.
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Liberal | William Alexander McArthur | 3,540 | 51.5 | N/A | |
| Liberal Unionist | Edward William Brydges Willyams | 3,329 | 48.5 | New | |
| Majority | 211 | 3.0 | N/A | ||
| Turnout | 6,869 | 77.3 | N/A | ||
| Liberal hold | Swing | N/A | |||
