The Tenuipalpidae family, commonly known as flat mites or false spider mites, is worldwide in distribution and is comprised of 891 valid species belonging to 34 genera. All tenuipalpid species are phytophagous and damage plants by directly feeding on the epidermal cells of the stems, leaves and fruits. For the first time a comprehensive study on Tenuipalpid mite's fauna was investigated in 2016-2017 in Lorestan Province. In this order, aerial parts of plants were sampled randomly and taken into the laboratory for processing. Mites were removed from plant leaves with a No. 0 paint brush under a Wild M8 stereomicroscope. The specimens were mounted directly on slides in Hoyer’s medium. In this research, 13 species belonging to four genera collected and identified. Among them, Tenuipalpus granati had highest population. All of species as new for Lorestan fauna except Cenopalpus quercusi and one of them is new to science (marked by *). Description of new species is in progress. The list of identified species is as follows: Aegyptobia Sayed 1950: 1. A. persicae Khosrowshahi & Arbabi, 1997; Cenopalpus Pritchard & Baker, 1958: 2. C. rubusi Khanjani et al., 2012; 3. C. khosrowshahi Khanjani et al., 2012; 4. C. quercusi Khanjani et al., 2012; 5. C. abaii khosrowshahi & Arbabi, 1997; 6. C. irani Dosse, 1971; Phytoptipalpus Tragardh, 1904: 7. P. rosa (Mitrofanov & Strunkova, 1978); 8. P. salicicola Al-Gboory, 1987; Tenuipalpus Donnadieu, 1875: 9. T. sp. nov.*; 10. T. granati Sayed, 1946; 11. T. punicae Pritchard & Baker, 1958; 12. T. kamalii Khosrowshahi & Arbabi, 1997; 13. T. euonymi Khosrowshahi, 1991.