Tyrannochthonius

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Tyrannochthonius is a genus of pseudoscorpions (tiny arachnids that look like scorpions but lack a tail) in the family Chthoniidae. It was described in 1929 by American arachnologist Joseph Conrad Chamberlin.

Classification:
- Kingdom: Animalia
- Phylum: Arthropoda
- Subphylum: Chelicerata
- Class: Arachnida
- Order: Pseudoscorpiones
- Family: Chthoniidae
- Genus: Tyrannochthonius (J.C. Chamberlin, 1929)

Type species: Chthonius terribilis (With, 1906)

Synonyms: Pholeochthonius (Beier, 1976); Parachthonius (Caporiacco, 1949)

As of October 2023, the World Pseudoscorpiones Catalog accepts several species within Tyrannochthonius.