Pachygnathidae may mean:
- Pachygnathidae Menge, 1866 [=Tetragnathidae Menge, 1866]
- Type genus: Pachygnatha Sundevall, 1823
- Pachygnathidae Kramer, 1877 [=Alycidae Canestrini & Fanzago, 1877]
- Type genus: Pachygnathus Dugès, 1834
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