1979-80 Eastern Canada Allan Cup Playoffs

These determined the Eastern Canadian representative in the 1980 Allan Cup Final.

Champions

 * New Brunswick: Shediac Capitals
 * Newfoundland: Gander Flyers
 * Northern Ontario: Thunder Bay Twins
 * Ontario: Cambridge Hornets

Quarter-Final
Best of 5
 * Shediac 7 Thunder Bay 3
 * Shediac Thunder Bay
 * Thunder Bay 5 Shediac 2
 * Thunder Bay 9 Shediac 7
 * Thunder Bay 6 Shediac 3

Thunder Bay Twins beat Shediac Capitals 3 wins to 2.

Semi-Final
Best of 5
 * Thunder Bay 9 Gander 1
 * Thunder Bay 10 Gander 2
 * Thunder Bay 10 Gander 4

Thunder Bay Twins beat Gander Flyers 3 wins to none.

Final

 * Cambridge 7 Thunder Bay 4
 * Thunder Bay 4 Cambridge 0
 * Cambridge 5 Thunder Bay 3
 * Cambridge 4 Thunder Bay 3

Cambridge Hornets beat Thunder Bay Twins 3 wins to 1.

'''Cambridge Hornets advanced to the 1980 Allan Cup Final.