| Arnold J. McGrath | |
| Office: | Member of the Legislative Assembly of British Columbia |
| Predecessor: | Frank Mitchell MacPherson |
| Successor: | Frank William Green |
| Term Start: | 1939 |
| Term End: | 1941 |
| Constituency: | Cranbrook |
| Birth Date: | 2 June 1912 |
| Birth Place: | Dodsland, Saskatchewan |
| Death Place: | Calgary, Alberta |
| Party: | British Columbia Liberal Party |
| Occupation: | salesman, manager |
| Alma Mater: | University of Saskatchewan University of Toronto |
Arnold Joseph McGrath (June 2, 1912 – August 24, 1967) was a Canadian politician. He served in the Legislative Assembly of British Columbia from 1939 to 1941 from the electoral district of Cranbrook, a member of the Liberal party.[1] [2] He was the youngest member of the legislature during his term of service.[3] McGrath died in Calgary in 1967.[4]