Oark is an unincorporated community and census-designated place (CDP) in Johnson County, Arkansas, United States.

[3] The community is surrounded by the Ozark National Forest with the scenic Mulberry River nearby.

The origin of the town’s name is unknown, although many believe it came from French trappers that frequented this isolated valley in the 18th century.

Archeologists believe that bluff-dwelling cultures thrived here as late as 500 B.C., and later the Osage Indians claimed the valleys drained by the Mulberry River as part of their hunting grounds.

Public education for elementary and secondary school students is provided by the Jasper School District, which includes: The campus is also the site of the "Tri-Centennial Tree" - an ancient southern red oak estimated to be over 300 years old.