The present study is based on ptyctimous oribatid mite material collected in Taiwan in 2018 and 2019. Four new species—Oribotritia chiayiensis Niedbała sp. nov. (Oribotritiidae), Phthiracarus liaoi Niedbała sp. nov. (Phthiracaridae), Plonaphacarus paraprotrusus Niedbała sp. nov. (Steganacaridae), and Notophthiracarus diamphidios Niedbała sp. nov. (Steganacaridae)—are described. Supplementary description of Acrotritia hauseri (Euphthiracaridae) is provided. A list of other identified ptyctimous mite taxa, including 10 species from six genera and five families, is presented. Four species (A. hauseri, A. mahunkai, Phthiracarus gibber, and P. parmatus) are recorded for the first time in Taiwan.