Synsphyronus xynus is a species of pseudoscorpion in the Garypidae family.

It was described in 2021 by Australian arachnologists Karen Cullen and Mark Harvey.

The specific epithet xynus ('common') refers to the species’ widespread distribution throughout the Pilbara region.

[1] The species occurs in the Pilbara region of North West Australia, where it is found beneath paperbark and eucalypt bark.

The type locality is 20 km south-west of Hancock Gorge in Karijini National Park.