The 1978 PGA Championship was the 60th PGA Championship played August 3-6 at Oakmont Country Club in Oakmont, Pennsylvania. John Mahaffey won the championship in a sudden-death playoff over Jerry Pate and Tom Watson.
| # | Player | Country | Score | To par | Winnings ($) |
|---|---|---|---|---|---|
| 1 | John Mahaffey* | United States | 75-67-68-66=276 | -8 | 50,000 |
| T2 | Jerry Pate | United States | 72-70-66-68=276 | 25,000 | |
| Tom Watson | United States | 67-69-67-73=276 | |||
| T4 | Gil Morgan | United States | 76-71-66-67=280 | -4 | 14,500 |
| Tom Weiskopf | United States | 73-67-69-71=280 | |||
| 6 | Craig Stadler | United States | 70-74-67-71=282 | -2 | 10,000 |
| T7 | Andy Bean | United States | 72-72-70-70=284 | E | 8,000 |
| Graham Marsh | Australia | 72-74-68-70=284 | |||
| Lee Trevino | United States | 69-73-70-72=284 | |||
| 10 | Fuzzy Zoeller | United States | 75-69-73-68=285 | +1 | 6,500 |
*Mahaffey defeated Pate and Watson with a birdie on the second hole of a sudden-death playoff. All three players made par on the first playoff hole
| Preceded by 1978 Open Championship |
Major Championships | Succeeded by 1979 Masters |
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