| Election Name: | 1921 Kirkcaldy Burghs by-election |
| Type: | presidential |
| Country: | United Kingdom |
| Previous Election: | Kirkcaldy Burghs (UK Parliament constituency)#Elections in the 1910s |
| Previous Year: | 1918 |
| Next Election: | Kirkcaldy Burghs (UK Parliament constituency)#Elections in the 1920s |
| Next Year: | 1922 |
| Election Date: | 4 March 1921 |
| Candidate1: | Kennedy |
| Party1: | Labour Party (UK) |
| Popular Vote1: | 11,674 |
| Percentage1: | 53.4% |
| Candidate2: | Lockhart |
| Party2: | Coalition Liberal |
| Popular Vote2: | 10,199 |
| Percentage2: | 46.6% |
| Map Size: | 250px |
| MP | |
| Posttitle: | Subsequent MP |
| Before Election: | Dalziel |
| Before Party: | Liberal Party (UK) |
| After Election: | Hutchison |
| After Party: | National Liberal Party (UK, 1922) |
The 1921 Kirkcaldy Burghs by-election was held on 4 March 1921. The by-election was held due to the resignation of the incumbent Coalition Liberal MP, Henry Dalziel. It was won by the Labour candidate Tom Kennedy.