A taxonomic study of the Philippine stick insects that belong in the subfamily Obriminae (family Heteropterygidae) is conducted and has yielded a considerable number of new synonyms and new species, that broaden our knowledge and represent a considerable step towards the inter- and intrageneric arrangement of this striking and polarising clade. In this matter, the genera Brasidas Rehn & Rehn, 1939, Eubulides Stål, 1877, Euobrimus Rehn & Rehn, 1939, Mearnsiana Rehn & Rehn, 1939, Obrimus Stål, 1875, Stenobrimus Redtenbacher, 1906, Theramenes Stål, 1877 and Trachyaretaon Rehn & Rehn, 1939 are reviewed in taxonomic and morphological aspect. The species contained in each genus are reorganised and identification keys are provided where appropriate. New records and information on the geographic distributions, as well as notes on the intraspecific variability of almost all concerned species are presented. The genus Euobrimus Rehn & Rehn, 1939 is synonymised with Brasidas Rehn & Rehn, 1939 (n. syn.), a synonymy that has already been proposed previously based on both morphological and molecular data. Therefore, all species contained in Euobrimus are automatically transferred to Brasidas with the exception of Euobrimus quadratipes (Bolívar, 1890), which is reinstated in its original genus Obrimus Stål, 1875. Nine new synonymies are revealed. The identity and synonymies of Brasidasa lacerta (Redtenbacher, 1906) n. comb., an endemic of the island of Mindanao, are clarified with six species and one subspecies synonymised with B. lacerta: Brasidas acanthoderus Rehn & Rehn, 1939; Brasidas foveolatus asper Rehn & Rehn, 1929; Brasidas montivagus Rehn & Rehn, 1939; Euobrimus atherura Rehn & Rehn, 1939; Euobrimus cleggi Rehn & Rehn, 1939; Euobrimus dohrni Rehn & Rehn, 1939; and Euobrimus stephenreyesi Lit & Eusebio, 2006 (n. syn.). The remarkable intraspecific variability of B. lacerta is discussed to support the new synonymies here introduced. Moreover, Euobrimus hoplites Rehn & Rehn, 1939 is shown to be a synonym of Brasidas bakeri (Rehn & Rehn, 1939) n. comb. (n. syn.) and Trachyaretaon brueckneri Hennemann & Conle, 2006 is synonymised with Trachyaretaon carmelae Lit & Eusebio, 2005 (n. syn.). Lectotypes are designated for Phasma (Acanthoderus) bufo Westwood, 1848, Obrimus lacerta Redtenbacher, 1906 and Euobrimus dohrni Rehn & Rehn, 1939 in order to provide stability of the concerned taxa. Eighteen new species and one new genus are described. Four new species are described in the genus Brasidas Rehn & Rehn, 1939: B. waray n. sp. from the island of Leyte is described solely from a unique female with the male and egg still unknown, B. malaki n. sp. is described from a unique male from the island of Leyte, B. manobo n. sp. from Mindanao and B. rehni n. sp. from the small island of Siargao is described from the male and female. Four new species are decribed in the genus Eubulides Stål, 1877: E. blaan n. sp. from Mindanao is described from both sexes and the eggs, the Mindanaon E. constanti n. sp. is described from a unique male, and the two morphologically very similar Eubulides timog n. sp. and Eubulides lumawigi n. sp. from the island of Luzon are described from both sexes but only the egg of the first species is known and described. The previously monotypic genus Mearnsiana Rehn & Rehn, 1939 is endemic to Mindanao and enhanced by the description of M. maranao n. sp., a species that is only known from a unique male. The previously monotypic genus Sungaya Zompro, 1996 is endemic to the island of Luzon and enriched by the descriptions of three new species: the two morphologically very close S. aeta n. sp. and S. ibaloi n. sp. are described from both sexes and the egg and the rather distinctive S. dumagat n. sp. is only known from a unique female. Six new species are described in the genus Trachyaretaon Reh & Rehn, 1939: T. maliit n. sp. from Luzon is the smallest known representative of the genus and described from the male and female, T. mangyan n. sp. from Mindoro Island, Trachyaretaon negrosanon n. sp. from the island of Negros, T. tumandok n. sp. from Panay Island and the two morphologically very similar T. bresseeli n. sp. and T. nakatago n. sp. from the island of Luzon are described from both sexes and the eggs. The new genus Armadolides n. gen. is described for comprising solely its distinctive type species A. manaobo (Acola et al., 2022) n. comb. from Mindanao, which is here transferred from the genus Eubulides. The holotypes of all newly described species are deposited in the collection of Institute Royal des Sciences Naturelles de Belgique, Bruxelles (RBINS) with the exception of Brasidas rehni n. sp. whose holotype is housed in the collection of the Academy of Natural Sciences, Philadelphia (ANSP). The previously unknown male and egg of Obrimus bufo (Westwood, 1848) and the egg of Trachyaretaon echinatus (Stål, 1877) are described and illustrated for the first time and the first illustrations are provided of the unknown adult female of Obrimus uichancoi Rehn & Rehn, 1939, which was previously only known from immature specimens. The egg of Brasidas bakeri (Rehn & Rehn, 1939) is described and illustrated for the first time. Illustrations are provided for the eggs of Aretaon asperrimus (Redtenbacher, 1906), Brasidas cavernosus (Stål, 1877) n. comb., Brasidas lacerta (Redtenbacher, 1908) n. comb., Brasidas samarensis Rehn & Rehn, 1939, Mearnsiana bullosa Rehn & Rehn, 1939, Obrimus bicolanus Redtenbacher, 1908, Trachyaretaon carmelae Lit & Eusebio, 2005 and Theramenes exiguus Hennemann & Conle, 2003.