| Ranald Roderick Macdonald | |
| Birth Date: | 1945 |
| Birth Place: | Aberdeen |
| Death Date: | 2007 |
| Death Place: | Stirling |
| Nationality: | British |
| Field: | Mathematical psychology |
| Known For: | significance testing |
Ranald Roderick Macdonald (1945 - 2007) was a British mathematician and psychologist. He was known for his contribution to the foundations of significance testing.[1]