The Jovian Jiro Spider is an arachnid-based unmanned robot that appears in the anime series Martian Successor Nadesico. During the war between Earth and Jupiter, these killing machines were used by the Jovian Federation as their main ground-based assault units.

Jiros are giant robotic spiders that have bulky red-coloured bodies and eight legs, though their legs are not really required for movement since the Jiros have tracks and boosters to propel them across the ground. Like the Grasshopper drones, Jiros carry a large number of micro-missiles concealed in their thoraxes. They can launch 30 at once, but have additional ammunition; Jiros' legs have been shown to snap off when they reload their missiles. They also carry laser cannons just beneath their heads.