Grylloidea are a very diverse orthopteran group. However, only two extinct families have been reported, dagger Baissogryllidae and dagger Protogryllidae, with very sparse fossil records. Here we present two newly discovered true cricket forewings (male) from the Middle Jurassic Yan'an Formation in Yulin City, Shaanxi Province, north-western China. We assign them to the subfamily dagger Baissogryllinae (dagger Baissogryllidae) and describe dagger Sinagryllus huangi sp. nov. This taxon can be distinguished from other baissogryllid genera and species by the following featuresGrylloidea are a very diverse orthopteran group. However, only two extinct families are reported, dagger Baissogryllidae and dagger Protogryllidae, with a very sparse fossil record. Here we present two newly discovered true cricket forewings (male) from the Middle Jurassic Yan'an Formation in Yulin City, Shaanxi Province, northwestern China. We assign them to the subfamily dagger Baissogryllinae (dagger Baissogryllidae) and describe dagger Sinagryllus huangi sp. nov. This taxon can be distinguished from other baissogryllid genera and species by the following features: M+CuA separating from R before 'r-m', CuPa beta only fused with diagonal vein 1 over an extremely short distance, and AP strongly arched basally. This discovery is the first record of dagger Baissogryllidae from the Middle Jurassic of China, adding to the biodiversity of this family and extending its geological distribution. Combined with previously reported species of Odonata (damselflies and dragonflies), our new findings indicate a great potential of the insect fossil locality at Yulin City. Finally, we also constructed the first character state matrix and estimated the relationships of the dagger Baissogryllidae using cladistic analysis (MP) and Bayesian inference. The monophyly the family remains uncertain, but three included subfamilies are supported as clades.https://zoobank.org/urn:lsid:zoobank.org:pub:BA25B7B0-5ABA-4E03-9BE3-8EA74F892050