| Leontiniidae | |
|---|---|
|   | |
| Leontinia gaudryi | |
| Scientific classification   | |
| Domain: | Eukaryota | 
| Kingdom: | Animalia | 
| Phylum: | Chordata | 
| Class: | Mammalia | 
| Order: | † Notoungulata | 
| Clade: | † Eutoxodontia | 
| Family: | † Leontiniidae Ameghino, 1895 | 
| Genera [1] | |
| 
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Leontiniidae is an extinct family comprising eighteen genera of notoungulate mammals known from the Middle Eocene (Mustersan) to Late Miocene (Huayquerian) of South America.