1977-78 Eastern Canada Allan Cup Playoffs

These playoffs determined the Eastern Canadian representative in the 1978 Allan Cup final.

Champions

 * Ontario: Brantford Alexanders
 * Newfoundland and Labrador: St. John's Capitals

Final
Best of 5


 * Brantford 11 St. John's 3
 * St. John's 8 Brantford 5
 * Brantford 10 St. John's 4
 * Brantford 8 St. John's 1

Brantford Alexanders beat St. John's Capitals 3 wins to 1.

Brantford Alexanders advanced to the 1978 Allan Cup Final.