| Position: | Centre |
| Played For: | New York Rangers Montreal Canadiens Streatham |
| Shoots: | Left |
| Height Ft: | 5 |
| Height In: | 7 |
| Weight Lb: | 165 |
| Birth Date: | 1918 7, mf=yes |
| Birth Place: | Montreal, Quebec, Canada |
| Death Place: | Brossard, Quebec, Canada |
| Career Start: | 1935 |
| Career End: | 1952 |
John Mahaffy (July 18, 1918 – May 2, 2015) was a Canadian professional ice hockey centre. He played 37 games in the National Hockey League with the New York Rangers and Montreal Canadiens from 1942 to 1945. The rest of his career, which lasted from 1935 to 1952, was spent in the minor leagues. Mahaffy was born in Montreal, Quebec. He married Angie Péloquin around 1961.[1] He died in May 2015 at the age of 96.[2]
| Regular season | Playoffs | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Season A | Team | League | GP | PIM | GP | G | A | Pts | PIM | |||||
| 1934–35 | Montreal Junior Royals | QJAHA | 10 | 3 | 6 | 9 | 4 | 2 | 0 | 0 | 0 | 0 | ||
| 1935–36 | Montreal Royals | Mtl Sr | 7 | 5 | 6 | 11 | 4 | — | — | — | — | — | ||
| 1936–37 | Montreal Royals | Mtl Sr | 21 | 4 | 8 | 12 | 16 | 5 | 0 | 1 | 1 | 2 | ||
| 1937–38 | Montreal Royals | MCHL | 22 | 4 | 3 | 7 | 20 | 1 | 0 | 0 | 0 | 2 | ||
| 1938–39 | Streatham | ENL | — | 4 | 4 | 8 | — | — | — | — | — | — | ||
| 1939–40 | Montreal Royals | MCHL | 29 | 9 | 13 | 22 | 25 | 8 | 2 | 0 | 2 | 12 | ||
| 1939–40 | Montreal Royals | Al-Cup | — | — | — | — | — | 5 | 0 | 4 | 4 | 0 | ||
| 1940–41 | Montreal Royals | MCHL | 33 | 17 | 25 | 42 | 60 | 8 | 6 | 5 | 11 | 16 | ||
| 1940–41 | Montreal Royals | Al-Cup | — | — | — | — | — | 9 | 4 | 2 | 6 | 22 | ||
| 1941–42 | Montreal Royals | QSHL | 38 | 9 | 16 | 25 | 35 | — | — | — | — | — | ||
| 1942–43 | Montreal Canadiens | NHL | 9 | 2 | 5 | 7 | 4 | — | — | — | — | — | ||
| 1942–43 | Montreal Royals | QSHL | 28 | 21 | 16 | 37 | 14 | 7 | 4 | 2 | 6 | 4 | ||
| 1943–44 | New York Rangers | NHL | 28 | 9 | 20 | 29 | 0 | — | — | — | — | — | ||
| 1943–44 | Montreal Army | MCHL | 4 | 0 | 0 | 0 | 0 | — | — | — | — | — | ||
| 1943–44 | Montreal Royals | QSHL | 4 | 2 | 6 | 8 | 2 | — | — | — | — | — | ||
| 1944–45 | Montreal Royals | QSHL | 3 | 5 | 4 | 9 | 4 | — | — | — | — | — | ||
| 1944–45 | Pittsburgh Hornets | AHL | 37 | 17 | 23 | 40 | 10 | — | — | — | — | — | ||
| 1944–45 | Montreal Canadiens | NHL | — | — | — | — | — | 1 | 0 | 1 | 1 | 0 | ||
| 1945–46 | Pittsburgh Hornets | AHL | 58 | 28 | 36 | 64 | 35 | 6 | 4 | 2 | 6 | 10 | ||
| 1946–47 | Buffalo Bisons | AHL | 63 | 29 | 40 | 69 | 37 | 4 | 0 | 0 | 0 | 0 | ||
| 1947–48 | Philadelphia Rockets | AHL | 60 | 26 | 57 | 83 | 6 | — | — | — | — | — | ||
| 1948–49 | Philadelphia Rockets | AHL | 67 | 21 | 50 | 71 | 10 | — | — | — | — | — | ||
| 1949–50 | Hershey Bears | AHL | 69 | 23 | 36 | 59 | 13 | — | — | — | — | — | ||
| 1950–51 | Hershey Bears | AHL | 33 | 5 | 14 | 19 | 7 | — | — | — | — | — | ||
| 1951–52 | Shawinigan Cataractes | QMHL | 60 | 16 | 28 | 44 | 18 | — | — | — | — | — | ||
| 1952–53 | St-Hyacinthe Saints | QPHL | 61 | 28 | 58 | 86 | — | — | — | — | — | — | ||
| AHL totals | 387 | 149 | 256 | 405 | 118 | 10 | 4 | 2 | 6 | 10 | ||||
| NHL totals | 37 | 11 | 25 | 36 | 4 | 1 | 0 | 1 | 1 | 0 | ||||