| Election Name: | 1921 Auckland East by-election |
| Country: | New Zealand |
| Flag Year: | 1921 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1919 New Zealand general election |
| Previous Year: | 1919 general |
| Next Election: | 1922 New Zealand general election |
| Next Year: | 1922 general |
| Turnout: | 6,621 |
| Candidate1: | Clutha Mackenzie |
| Party1: | Reform Party (New Zealand) |
| Popular Vote1: | 2,613 |
| Percentage1: | 38.76 |
| Candidate2: | John A. Lee |
| Party2: | New Zealand Labour Party |
| Popular Vote2: | 2,212 |
| Percentage2: | 32.81 |
| Candidate3: | George Warren Russell |
| Party3: | New Zealand Liberal Party |
| Popular Vote3: | 1,053 |
| Percentage3: | 15.62 |
| Member | |
| Before Election: | Arthur Myers |
| Before Party: | New Zealand Liberal Party |
| After Election: | Clutha Mackenzie |
| After Party: | New Zealand Reform Party |
The 1921 Auckland East by-election was a by-election in the New Zealand electorate of Auckland East, an urban seat at the top of the North Island.
The by-election was held on 2 December 1921, and was precipitated by the resignation of sitting Liberal member of parliament and former Mayor of Auckland, Arthur Myers.
The Labour Party selected John A. Lee, the President of the Auckland Labour Representation Committee, as their candidate. Unsuccessful nominees for the Labour candidacy were Rex Mason, James Purtell and Robert Frederick Way.[1]
The following table gives the election results:
Lee defeated Mackenzie in the ; both had war disabilities.