避日目（学名：Solifugae）隶属节肢动物门蛛形纲，现存12科，141属，共计一千余种，俗称避日蛛或风蝎，分布于非洲、亚洲及美洲的热带和亚热带沙漠。避日蛛的躯体类似蜘蛛，分为头胸部和腹部，没有类似蝎子的鞭状第三体节。大部分种类头胸部前端具有特征性的巨大螯肢，用以进食和发声。避日蛛移动速度快，体型较大，常被民间传说夸张的描述为一种危险可怕的生物，但它们对人畜基本无害。除了毒日蛛科的Rhagodes nigrocinctus外，其它日蛛都没有毒腺。

The Solifugae are an order of animals in the class Arachnida known variously as camel spiders, wind scorpions, sun spiders, or solifuges. The order includes more than 1,000 described species in about 153 genera. Despite the common names, they are neither true scorpions (order Scorpiones) nor true spiders (order Araneae) – though they are more closely related to scorpions than to spiders. Much like a spider, the body of a solifugid has two tagmata: an opisthosoma (abdomen) behind the prosoma (that is, in effect, a combined head and thorax). At the front end, the prosoma bears two chelicerae that, in most species, are conspicuously large. The chelicerae serve as jaws and in many species also are used for stridulation. Unlike scorpions, solifugids do not have a third tagma that forms a "tail". Most species of Solifugae live in dry climates and feed opportunistically on ground-dwelling arthropods and other small animals. The largest species grow to a length of 12–15 cm (5–6 in), including legs. A number of urban legends exaggerate the size and speed of the Solifugae, and their potential danger to humans, which is negligible.