A new coccidian parasite of the genus Caryospora Léger is described from the colubrid snake Boiga dendrophila Boie, 1827 imported from Kalimantan. Oocysts of Caryospora kalimaniunensis sp. n. are spherical, 18.7 (17.0-20.0) pm in diameter, with a bilayered slightly pitted and brownish oocyst wall. A micropyle and oocyst residuum are absent. One globular polar granule is present in 45% of sporulated oocysts. Sporocysts are ovoidal to ellipsoidal, 14.5 (13.0-15.5) x 10.5 (10.0-11.0) pm, with prominent Stieda and substieda bodies. Sporocyst residuum is present as small granules scattered among sporozoites. Sporozoites are elongate, lying lengthwise and parallel within the sporocyst and completely filling the sporocyst. Each sporo-zoite contains a spherical anterior and posterior refractile bodies.