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This study forms a review of the subfamily Tachininae in the northern slopes of the Alborz Mountains and northwestern Iran from 2010 to 2014. A total of 23 genera and 37 species belonging to 11 tribes of the subfamily Tachininae are reviewed. Among them, three genera and 11 species are new records to the fauna of Iran. The collected data of all species, together with their current general distribution and reported hosts are presented. Identification keys to the 23 genera and 37 species found in the studied regions are also provided.

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The fauna of the family Tachinidae (Diptera) was studied in the Haftad-Qolleh Protected Area, Markazi province, Iran. A total of 86 species belonging to 67 genera have been collected of which 46 species within 19 genera are newly recorded from Iran. The species Magripa persica Gilasian & Ziegler sp. nov. is described as new to science. Diagnostic characters for the newly recorded taxa are provided. Illustrations of the male terminalia and head of the new species as well as habitus images of the new records are presented.

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Minthodes oramanatae Gilasian & Ziegler sp. nov. is described as new to science from western province of Kermanshah, Iran. This species is separated from other Minthodes species by its shiny black abdomen, narrow frons, long postpedicel, presence of basal scutellar marginal setae, short petiole of wing cell r₄₊₅ and absence of marginal setae on abdominal tergite 2. Photographs of the male habitus and terminalia are given. The comparison of the morphological characters of M. oramanatae Gilasian & Ziegler sp. nov. with its closely related species M. atra (Kugler, 1971) and M. rossica (Mesnil, 1963) is provided. Photographs of the habitus and male terminalia of M. atra are presented for the first time. The identification key to the Iranian Minthodes species is provided.

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The discovery of the Holarctic tachinid genus Solieria Robineau-Desvoidy, 1849, in Iran led to the identification of a new species to science, which is described here as Solieria variabilis sp. nov. It can be separated from other related species by the absence of discal setae on abdominal tergites, lack of proclinate and latero-reclinate orbital setae in the male, the width of frons, and by colouration and microtrichosity of abdomen. The comparison of the morphological characters of S. variabilis sp. nov. with its close relatives S. fenestrata (Meigen, 1824) and S. pacifica (Meigen, 1824) is provided. Photographic images of the habitus and head as well as illustrations of terminalia are given.