The 1977-78 Ottawa District Intermediate Playoffs were won by the Embrun Panthers. They finish second in their pool in the round robin portion of the 1977-78 Eastern Canada Intermediate Playoffs to advance to the semi-final. They defeated the host Fredericton Chevies in the semi-final, 8 to 1. They lost to the New Brunswick champion Campbellton Tigers in the finals, 5 to 2.
No further information is available on the actual playoffs ifself.