Agathia is a genus of moths in the family Geometridae described by Achille Guenée in 1858.

Palpi with second joint upturned and reaching vertex of head, and third joint porrect (extending forward), which is short in male and long in female.

Hind tibia of male dilated with a fold containing a tuft of long hair and ending in a short process on upperside.

Hindwings with vein 3 from angle of cell.

The outer margin produced to a point at vein 4.