| Summary: | The paper treats 51 species of geometroid moths (Lepidoptera: Uraniidae and Geometridae) from Sakhalin and Moneron islands, Russian Far East. Among them, one species (Trichopteryx fastuosa Inoue) is first reported from Russia; ten species—first recorded for Sakhalin (Uranidae Epipleminae: Eversmannia exornata (Eversmann), Dysaethria illotata (Christoph), and D. moza (Butler); Geometridae: Idiotephria evanescens (Staudinger), Lampropteryx minna (Butler), Lomographa simplicior (Butler), Pachyerannis obliquaria (Motschulsky), Venusia phasma (Butler), V. semistrigata (Christoph), and Zanclidia testacea (Butler), and two geometrid species—first recorded for Moneron (Acasis exviretata Inoue, and Abraxas niphonibia Wehrli). For 26 species, which Beljaev and Mironov (2019) first noted for Sakhalin without label data on the specimens, relevant materials are published. For nine species previously recorded from Sakhalin by single or few specimens or whose habitation on the island was in doubt, new confirming data are provided. For eight species erroneously reported from Sakhalin, their identifications are corrected and they are excluded from the fauna of the island (“Acasis appensata”, “Comibaena tancrei”, “Dysstroma korbi”, “Eilicrinia nuptaria”, “Eupithecia neosatyrata”, “Myrioblephara nanaria”, “Photoscotosia lucicolens”, and “Trichopteryx incerta”). The nominal taxon Eupithecia consueta Butler is restored from a synonymy with Pasiphila chloerata (Mabille) as a subspecies Pasiphila chloerata consueta (Butler), stat. n. In Trichopteryx Hübner and Pasiphila Meyrick, the presence of two “cryptic” species in East Asia is suggested. Extended notes on the general distribution, misidentifications and / or identification characters are provided for Eversmannia exornata, Dysaethria illotata, D. moza, Abraxas niphonibia, Acasis exviretata, Dysstroma citrata (Linnaeus), Eulithis achatinellaria (Oberthür), Ecliptopera pryeri (Butler), Idaea foedata (Butler), Laciniodes denigrata Warren, Lampropteryx minna (Butler), Larerannis ...
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