| Mercer Davies | |
| Nationality: | South African |
| Sport: | Long-distance running |
| Event: | Marathon |
| Birth Date: | 10 December 1924 |
| Birth Place: | East London, South Africa |
| Death Place: | Johannesburg, South Africa |
Mercer Davies (10 December 1924 - 26 January 1997) was a South African long-distance runner. He competed in the marathon at the 1956 Summer Olympics.[1]