| Megatrigoniidae Temporal range: from Jurassic to Cretaceous,
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| A fossil of Pterotrigonia caudata (Agassiz 1840) from the Isle of Wight at Galerie de paléontologie et d'anatomie comparée, Paris | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Trigoniida |
| Superfamily: | †Megatrigonioidea |
| Family: | †Megatrigoniidae Van Hoepen, 1929 |
Megatrigoniidae is an extinct family of fossil saltwater clams, marine bivalve molluscs in the subclass Palaeoheterodonta. This family of bivalves is known in the fossil record from the Jurassic period, Tithonian age, to the Cretaceous period, Maastrichtian age. Species in this family were facultatively mobile infaunal suspension feeders.