Fallicambarus tenuis is a species of crayfish in the genus Fallicambarus in the family Cambaridae. It was the only species in the subgenus Procambarus (Tenuicambarus) before DNA analysis suggested a reclassification.
Fallicambarus tenuis is rare throughout its range, which is restricted to the Ouachita Mountains of Le Flore County, Oklahoma and Polk County, Arkansas.