The 1977–78 season of the Tongan A Grade was the sixth recorded season of top flight association football competition in Tonga. Veitongo FC won the championship, their first title. The season began on December 17, 1977.

Teams Funga'onetaka Kolofoʻou Ma'ufanga Ngeleʻia FC Toafaka'amu Veitongo I Veitongo II

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