Myxococcus llanfair­pwll­gwyn­gyll­go­gery­chwyrn­drobwll­llan­tysilio­gogo­gochensis is a gram-negative, rod-shaped species of myxobacteria found in soil. It is a predator on other bacteria.

The ends of the rod-shaped vegetative cells taper slightly. The colonies are usually pale brown and show swarming motility. It produces orange, roughly spherical fruiting bodies. A draft sequence of its genome showed significant differences from all previously known species of the genus Myxococcus.

The species was isolated from soil collected near the village of Llanfairpwllgwyngyll, on the island of Anglesey in North Wales, and its specific name was given after the settlement's 58-character lengthened name (Llanfair­pwll­gwyn­gyll­go­gery­chwyrn­drobwll­llan­tysilio­gogo­goch), which is the longest in Europe.