Wattia is a genus of flies in the family Tachinidae.

The species, now extinct was discovered by John Russell Malloch in 1938.

[2] The genus use to roam New Zealand before its extinction, mostly forested areas and either lakes and either areas with food sources, like fruit and carcasses, mostly dead animal matter.

Like many other genuses in the family Tachinidae and Tachininae, it's diet mainly consisted of either nuts and fruit, and in large groups feeding on dead animal carcasses before the genus' extinction in New Zealand.

Like other fly genuses in the family Tachinidae and Tachininae, it may have been around the size of a house fly with male adults being larger than the female adults.