| Office: | Teachta Dála |
| Term Start: | July 1959 |
| Term End: | October 1961 |
| Constituency: | Meath |
| Birth Date: | 11 November 1908 |
| Birth Place: | County Meath, Ireland |
| Death Place: | County Meath, Ireland |
| Party: | Fianna Fáil |
Henry Martin Johnston (11 November 1908 – 9 January 1977) was an Irish Fianna Fáil politician.[1] A farmer by trade, he was elected to Dáil Éireann as a Fianna Fáil Teachta Dála (TD) for the Meath constituency at the 1959 by-election caused by the death of James Griffin of Fianna Fáil. He lost his seat at the 1961 general election.[2]