| Election Name: | 1891 Christchurch by-election |
| Country: | New Zealand |
| Flag Year: | 1891 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1890 New Zealand general election |
| Previous Year: | 1890 general |
| Next Election: | 1893 New Zealand general election |
| Next Year: | 1893 general |
| Election Date: | 9 October 1891 |
| Turnout: | 6,921 |
| Candidate1: | Ebenezer Sandford |
| Party1: | Liberal–Labour (New Zealand) |
| Popular Vote1: | 1,851 |
| Percentage1: | 51.45 |
| Candidate2: | John Tippet Smith |
| Party2: | New Zealand Liberal Party |
| Popular Vote2: | 1,109 |
| Percentage2: | 30.83 |
| Candidate3: | Eden George |
| Party3: | Conservative (New Zealand) |
| Popular Vote3: | 637 |
| Percentage3: | 17.70 |
| Member | |
| Before Election: | Westby Perceval |
| After Election: | Ebenezer Sandford |
| Before Party: | New Zealand Liberal Party |
| After Party: | Liberal–Labour (New Zealand) |
The Christchurch by-election of 1891 was a by-election during the 11th New Zealand Parliament held on 9 October that year in the electorate. It was triggered by the resignation of sitting member Westby Perceval who had been appointed as the new Agent-General in the United Kingdom.
The election would later come under protest by Eden George who claimed that nominations had been accepted too late to warrant candidacy.[1]
The following table gives the election results: