ABSTRACTWe describe and illustrate Fantosmium qizhihaoi gen. et sp. nov., a new histerid beetle from mid‐Cretaceous Kachin amber, and evaluate its phylogenetic position based on morphological characters. Our analysis recovers Fantosmium as part of the extant subfamily Onthophilinae, allied to the Cretaceous genera Cretonthophilus Caterino et al., Phasmister Caterino, and Carinumerus Caterino. It resembles these fossil genera in possessing ventrally open hypomeral antennal cavities and a projecting prosternal lobe. Fantosmium is particularly distinctive in its elytral morphology, exhibiting weakly elevated elytral carinae ornamented with small denticles, an intercarinal surface bearing irregular reticulate sculpture, explanate and irregularly punctate epipleura, and a strongly undulate posterior elytral margin. The discovery of Fantosmium provides new insights into the early evolutionary history and morphological diversity of Onthophilinae.