We report the publication of 953 DNA barcodes of forest leaf litter beetles from central Taiwan, in total representing 334 species of 36 beetle families. This is the first bulk of data from the Taiwanese Leaf Litter beetles project focused on uncovering the under-explored diversity of leaf litter beetles across Taiwan. Based on these data, we provide the first records of the following taxa for Taiwan: family Sphindidae (genusAspidiphorusZiegler, 1821); tribes Trichonychini, Ctenistini, and Bythinoplectini (all Staphylinidae: Pselaphinae); generaGyrelonHinton, 1942,ThyroderusSharp, 1885,CautomusSharp, 1885 (all Cerylonidae),DermatohomoeusHlisnikovský, 1963 (Leiodidae),ParaploderusHerman, 1970 (Staphylinidae: Oxytelinae),ThinocharisKraatz, 1859 (Staphylinidae: Paederinae),CephennodesReitter, 1884,NapoconnusFranz, 1957 (both Staphylinidae: Scydmaeninae),BicavaBelon, 1884 (Latridiidae),OtibazoMorimoto, 1961,SeleucaPascoe, 1871 andAcallinusMorimoto, 1962 (all Curculionidae); species Oodes (Lachnocrepis) japonicus (Bates, 1873) (Carabidae: Licininae),Drusilla obliqua(Bernhauer, 1916) (Staphylinidae: Aleocharinae) andCoccotrypes advenaBlandford, 1894 (Curculionidae: Scolytinae). The records ofAnapleusHorn, 1873 (Histeridae) andBatraxisReitter, 1882 (Staphylinidae: Pselaphinae) have been confirmed. The male ofSivacrypticus taiwanicusKaszab, 1964 (Archeocrypticidae) is described for the first time.Gyrelon jenpaniHu, Fikáček & Matsumoto,sp. nov.(Cerylonidae) is described, illustrated, and compared with related species. DNA barcodes associated larvae of 42 species with adults, we are concisely illustrating some of these:Oodes japonicus, Perigona cf. nigriceps Dejean, 1831 (both Carabidae),Ptilodactylasp. (Ptilodactylidae),Maltypus ryukyuanusWittmer, 1970 (Cantharidae),Drusilla obliqua,Myrmecocephalus brevisulcus(Pace, 2008),Diochussp.,Mimopinophilussp. (all Staphylinidae),Stelidota multiguttataReitter, 1877,Lasiodites inaequalis(Grouvelle, 1914) (both Nitidulidae),Lagria scutellarisPic, 1910, andAnaedus spinicornisKaszab, 1973 (both Tenebrionidae). We also report the first cases ofRickettsiainfections in Scydmaeninae and Pselaphinae. All data (sequences, metadata, and voucher photos) are made public in BOLD database and in a Zenodo Archive.