The species of Agraphydrus RÉGIMBART, 1903 from Bhutan, India, Nepal, Pakistan, and Sri Lanka are revised. Agraphydrus exedis (ORCHYMONT, 1937), A. indicus (ORCHYMONT, 1932), A. kempi (ORCHYMONT, 1922), A. montanus MINOSHIMA et al., 2015, A. pauculus (KNISCH, 1924), A. pyg- maeus (KNISCH, 1924), A. stagnalis (ORCHYMONT, 1937), and A. uvaensis (HEBAUER, 2000) are redescribed. Thirty-six new species are described: Agraphydrus anatinus, A. andamanicus, A. angus- tipenis, A. annapurnensis, A. ater, A. bhutanensis, A. boukali, A. ceylonensis, A. cinnamum, A. com- munis, A. constrictus, A. crassipenis, A. falcatus, A. flavonotus, A. fortis, A. gilvus, A. glaber, A. hein- richi, A. hygropetricus, A. inflatus, A. kallar, A. khasiensis, A. kodaguensis, A. meghalayanus, A. na- nus, A. nepalensis, A. obscuratus, A. obsoletus, A. protentus, A. pullus, A. punctulatus, A. rostratus, A.rugosus, A. sipekorum, A. taprobanensis, and A. tumulosus. Lectotypes are designated for A. pauculus and A. pygmaeus. Specimens from Afghanistan, recorded under the name "Agraphilydrus pauculus KNISCH" by CHIESA (1967) were also examined; they belong to Agraphydrus, but they could not be identified to species level. The genus Agraphydrus is recorded from Bhutan for the first time; A. coomani (ORCHYMONT, 1927) is recorded from the Indian Subcontinent (Sri Lanka) for the first time; other new records: A. connexus KOMAREK & HEBAUER, 2018 from Bhutan and India; A. indicus from Bhutan and Nepal; and A. kempi, A. pygmaeus, A. stagnalis from Bhutan. A total of 46 species is now known from the Indian Subcontinent. Agraphydrus coomani and A. connexus are widespread in the Oriental Region, the former also in the Australian Region; all other species are restricted to the Indian Subcontinent. Six of the seven species known from Sri Lanka are endemic to this island. The habitat of four species is unknown, all other species are aquatic, nine were found in hygropetric habitats. Habitus, male genitalia and other morphological details are illustrated, distribution maps are presented, and a key to the species is added.