Fifty-two species are placed in the Bactrocera dorsalis complex in Asia, eight of which are considered of economic importance. Twelve species are revised and the following forty new species described: Bactrocera atrifemur, B. bimaculata, B. carambolae, B. cibodasae, B. collita, B. floresiae, B. fulvifemur, B. fuscitibia, B. gombokensis, B. indonesiae, B. infulata, B. irvingiae, B. kanchanaburi, B. kandiensis, B. kinabalu, B. lateritaenia, B. latilineola, B. lombokensis, B. makilingensis, B. malaysiensis, B. melastomatos, B. merapiensis, B. minuscula, B. neocognata, B. neopropinqua, B. osbeckiae, B. papayae, B. penecognata, B. philippinensis, B. pyrifoliae, B. quasipropinqua, B. raiensis, B. sembaliensis, B. sulawesiae, B. sumbawaensis, B. thailandica, B. unimacula, B. usitata, B. verbascifoliae and B. vishnu. A key to species within the complex is presented. Information is given on location of type specimens, host-plants, attractant records and geographic distribution. Lectotypes are designated for B. dorsalis (Hendel), B. mangiferae (Cotes) (a synonym of B. zonata (Saunders)) and B. pedestris (Bezzi).