| Position: | Defence |
| Shoots: | Right |
| Height Ft: | 6 |
| Height In: | 2 |
| Weight Lb: | 205 |
| Played For: | Colorado Rockies |
| Birth Date: | February 12, 1955 |
| Birth Place: | Sarnia, Ontario, Canada |
| Draft: | Undrafted |
| Career Start: | 1978 |
| Career End: | 1981 |
John Walter McCahill (born February 12, 1955) is a Canadian retired professional ice hockey defenceman who played in one National Hockey League game for the Colorado Rockies during the 1977–78 NHL season.
| Regular season | Playoffs | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Season | Team | League | GP | PIM | GP | G | A | Pts | PIM | |||||
| 1972–73 | Sarnia Bees | WOHL | — | — | — | — | — | — | — | — | — | — | ||
| 1974–75 | University of Michigan | B-10 | 21 | 0 | 7 | 7 | 18 | — | — | — | — | — | ||
| 1975–76 | University of Michigan | B-10 | 42 | 3 | 23 | 26 | 28 | — | — | — | — | — | ||
| 1976–77 | University of Michigan | B-10 | 45 | 0 | 27 | 27 | 54 | — | — | — | — | — | ||
| 1977–78 | University of Michigan | B-10 | 35 | 5 | 23 | 28 | 32 | — | — | — | — | — | ||
| 1977–78 | Colorado Rockies | NHL | 1 | 0 | 0 | 0 | 0 | — | — | — | — | — | ||
| 1977–78 | Tulsa Oilers | CHL | 9 | 1 | 0 | 1 | 0 | 7 | 0 | 0 | 0 | 7 | ||
| 1978–79 | Philadelphia Firebirds | AHL | 77 | 5 | 12 | 17 | 36 | — | — | — | — | — | ||
| 1979–80 | Fort Worth Texans | CHL | 31 | 4 | 14 | 18 | 10 | — | — | — | — | — | ||
| 1979–80 | Oklahoma City Stars | CHL | 51 | 4 | 19 | 23 | 14 | — | — | — | — | — | ||
| 1980–81 | Fort Worth Texans | CHL | 8 | 1 | 2 | 3 | 11 | — | — | — | — | — | ||
| 1980–81 | Muskegon Mohawks | IHL | 48 | 7 | 20 | 27 | 29 | — | — | — | — | — | ||
| AHL totals | 245 | 59 | 98 | 157 | 494 | 23 | 5 | 6 | 11 | 57 | ||||
| NHL totals | 1 | 0 | 0 | 0 | 0 | — | — | — | — | — | ||||