Biffarius is a genus of ghost shrimp in the family Callianassidae, containing species formerly included in the genus Callianassa. Its members are small and generally live in the intertidal zone. In April 2020, a new species was described from the northeastern Brazilian coast. Biffarius was named in honour of Thomas A. Biffar, and includes the following species:

• Biffarius biformis (Biffar, 1971)
• Biffarius botterae (Hernáez, Miranda & Tavares, 2020)
• Biffarius delicatulus Rodrigues & Manning, 1992
• Biffarius limosus (Poore, 1975)

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