Diplolepis nodulosa, also known as the rose-stem gall wasp, is a species of cynipid wasp that induces bud galls on wild roses in North America.

[1] This galls induced by this species have a number of inquilines and parasitoids.

[2] D. nodulosa is assigned to a clade of Nearctic stem gallers within Diplolepis along with Diplolepis californica, Diplolepis oregonesis, Diplolepis spinosa, and Diplolepis triforma.

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