Cleonymia yvanii is a moth of the family Noctuidae first described by Philogène Auguste Joseph Duponchel in 1833. It is found in Portugal, north-eastern Spain, southern France and north-eastern Italy.
The wingspan is 18–25 mm.
Adults are variable in colour, ranging from ochre to greyish brown. Warren (1914) states C. yvanii Dup. (24 f). Much like vaulogeri Stgr.,[''[[Cleonymia vaulogeri]] (Staudinger, 1899)] the inner and outer lines similarly incurved and connected on submedian fold; orbicular and reniform stigmata very small, with fuscous centres and greyish annuli, separated by a diffuse brown median shade; submarginal line grey, obscure, whitish and oblique at costa; fringe brown in basal half, chequered in outer; hindwing fuscous, the base paler;—korbi Stgr.[now species ''[[Cleonymia korbi]]] is paler, without the black streak in base of cell of forewing. S. France and Spain. Larva yellowish white, the lateral lines red, the dorsal line dark, interrupted; feeding on seeds of Helianthemum.[1]
Adults are on wing from the end of April to mid-July in one generation per year.
The larvae feed on Helianthemum species. They can be found in late summer. The species overwinters in the pupal stage.