Falx may refer to:

• Falciform ligament, a ligament of the liver
• Falx, a sickle, scythe or sickle-like weapon used by Dacians
• Falx cerebelli and falx cerebri, two parts of the dura mater of the brain
• Foramen ovale (heart), a fetal cardiac shunt, also called the falx septi
• Nu Persei
• Conjoint tendon, a sickle-shaped tendon of the transversus abdominis muscle, also called the inguinal aponeurotic falx
• Chelicerae, mouthparts of certain arthropods

This disambiguation page lists articles associated with the title Falx.
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