Ascyltus are a genus of jumping spiders in the family Salticidae that was first described by Ferdinand Anton Franz Karsch in 1878. As of December 2020, the genus contained 10 species. Ascyltus spiders utilize their vision in courtship, hunting, and navigation. They are typically large to medium-sized salticids and often move relatively slowly. However, they are capable of agile jumps when moving, hunting, or to avoid predators. They have well-developed book lungs and tracheal systems, and they are capable of utilizing both systems. Ascyltus have four pairs of eyes, with the anterior median pair being the most prominent. One distinguishable characteristic of the genus is their antero-lateral carapace, which is iridescently coloured.

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