小牙草属（学名：Dentella）是茜草科下的一个属，为纤弱草本植物。该属共有10种，分布于热带亚洲、大洋洲和太平洋岛屿。

• Dentella asperata
• Dentella browniana
• Dentella concinna
• Dentella dioeca
• Dentella minutissima
• Dentella misera
• Dentella pulvinata
• 小牙草（Dentella repens）

Dentella is a genus of flowering plants in the Rubiaceae family. Most species genus are endemic to Australia, with one species also extending through southeast Asia to subtropical Asia and the southwestern Pacific.