Goals Against Average is goals allowed per 60 minutes by a goalie. Lower is better. Below are the top 16 NHL playoff players ranked by Playoff Goals Against Average for 1977-78.
| # | Player | Team | GAA |
|---|---|---|---|
| 1 | 1.27 | ||
| 2 | 1.90 | ||
| 3 | 2.08 | ||
| 4 | 2.34 | ||
| 5 | 2.42 | ||
| 6 | 2.75 | ||
| 7 | 2.76 | ||
| 8 | 2.87 | ||
| 9 | 3.00 | ||
| 10 | 3.46 | ||
| 11 | 3.55 | ||
| 12 | 4.00 | ||
| 13 | 4.01 | ||
| 14 | R. LowRon Low 27YG | 4.25 | |
| 15 | 4.53 | ||
| 16 | 5.50 |