| Type: | by-election |
| Country: | Barbados |
| Turnout: | 73.5% |
| Previous Election: | 1981 Barbadian general election |
| Previous Year: | 1981 |
| Next Election: | 1986 Barbadian general election |
| Next Year: | 1986 |
| Election Date: | 23 May 1985 |
| Candidate1: | David Simmons |
| Party1: | Barbados Labour Party |
| Popular Vote1: | 3,036 |
| Percentage1: | 54.52% |
| Candidate2: | Ronald Rock |
| Party2: | Democratic Labour Party (Barbados) |
| Popular Vote2: | 2,533 |
| Percentage2: | 45.48% |
| MP | |
| Before Election: | Tom Adams |
| Before Party: | Barbados Labour Party |
| After Election: | David Simmons |
| After Party: | Barbados Labour Party |
A by-election was held in the Barbadian constituency of the St.Thomas on 23 May 1985 after the death of the second prime minister of Barbados Tom Adams. He was a Barbados Labour Party member and the representative of the constituency in the House of Assembly of Barbados.[1]
David Simmons won the election. Turnout was 73.5%.