| Ralph Johnstone | |
| Office: | MLA for 1st Queens |
| Predecessor: | Walter Russell Shaw |
| Alongside: | Jean Canfield |
| Successor: | Leone Bagnall |
| Term Start: | 1970 |
| Term End: | 1979 |
| Birth Date: | 5 May 1914 |
| Birth Place: | Long River, Prince Edward Island |
| Death Place: | Summerside, Prince Edward Island |
| Party: | Liberal |
Ralph Warren Johnstone (May 5, 1914 – August 25, 2010) was a Canadian politician and farmer. He represented 1st Queens in the Legislative Assembly of Prince Edward Island from 1970 to 1979 as a Liberal.[1]
Johnstone was born in 1914 in Long River, Prince Edward Island.[1] He married Marion Hazel Howard in 1945.[1] A farmer by career, Johnstone operated two farms and was an active member of the Federation of Agriculture.[1]
Johnstone entered provincial politics in the 1970 election, when he was elected councillor for the electoral district of 1st Queens.[2] He was re-elected in the 1974,[3] and 1978 elections.[4] Johnstone was defeated by Progressive Conservative Leone Bagnall, when he ran for re-election in 1979.[5]
Johnstone died in Summerside, Prince Edward Island in August 2010.[6]