Gracilentus is a genus of spiders in the family Linyphiidae.
All described species are endemic to China.
The genus is named Latin gracilentus "slender" (according to the authors "simple") for the simple paracymbium in the male palp.
G. denticulatus is named after the radix with teeth in the male palp. G. serratus is from Latin serratus "saw-edged", for the saw-shaped posterior margin of the ventral plate in the epigyne. G. tengchongensis is named after the type locality, Tengchong County () in Yunnan Province.
G. mangshanensis is named after its type locality, Mangshan () in Hunan Province.
, this genus includes four species: