The EFSA Plant Health Panel performed a pest categorisation of Setoptus parviflorae (Acari: Eriophyoidea: Phytoptidae) for the European Union (EU). This mite is not listed in Annex II of Commission Implementing Regulation (EU) 2019/2072. It is known to occur in the Nanjing Botanical Garden (China) on Pinus parviflora. This is its only known host plant and location. The mite occurs on the needles and in the needle sheaths. Details about its life cycle are mostly unknown. Plants for planting, including dwarfed plants, of P. parviflora are the main potential pathway for entry into the EU. However, plants of the genus Pinus other than fruit and seeds are mostly prohibited from entering the EU (Commission Implementing Regulation (EU) 2019/2072). The host, P. parviflora, can be found in temperate-zone gardens and arboreta, and is a popular tree for bonsai in the EU. Although the Köppen–Geiger climate type Cfa (humid subtropical), which occurs in Nanjing, can be found in the EU, the growing conditions of P. parviflora at the Nanjing Botanical Garden were not reported. This adds uncertainty about where in the EU this mite could establish, most probably on ornamental P. parviflora. There is no evidence of impact of S. parviflorae. Measures to prevent entry and spread are available. S. parviflorae does not satisfy all the criteria that are within the remit of EFSA to assess for it to be regarded as a potential Union quarantine pest, as there is no evidence of impact.