Dioptinae is a subfamily of the moth family Notodontidae.
The Dioptinae are an almost exclusively neotropical group of day-flying moths.
The subfamily was formerly placed in a separate family (Dioptidae). Furthermore, the tribe Josiini has been treated as a family (Josiidae) by Piepers & Snellen in 1900 and as a subfamily (Josiinae) by Kiriakoff in 1950.