The Aleiodes (Aleiodes) and Aleiodes (Arcaleiodes) species of Thailand are revised based on extensive recent collecting as well as existing museum material, and combining evidence from DNA barcoding (5 end of mitochondral cytochrome oxidase 1) for sequenced material with species known from morphological data alone. The approach taken (here termed 'turbo-taxonomy') has been to rely heavily on colour light microscopy photographic illustration, with brief descriptions contributing principally to characters that are not apparent from the micrographs. All new species are attributed to Quicke & Butcher. Although the very high level of diversity of the Thai fauna means this is necessarily preliminary, in the sense that there are undoubtedly many more species awaiting to be described, it is the first reasonably comprehensive study of a tropical Aleiodes fauna. One hundred and seventy six new species of the subgenus Aleiodes (viz. Aleiodes achingae sp. nov., Aleiodes aciculodeum sp. nov., Aleiodes adorabelleae sp. nov., Aleiodes agagg sp. nov., Aleiodes alboluteus sp. nov., Aleiodes anguaae sp. nov., Aleiodes angulodeum sp. nov., Aleiodes antescutum sp. nov., Aleiodes apiconigrus sp. nov., Aleiodes archicolorus sp. nov., Aleiodes areelucki sp. nov., Aleiodes ascrobi sp. nov., Aleiodes asperum sp. nov., Aleiodes atuin sp. nov., Aleiodes bachmaduplus sp. nov., Aleiodes bachmatriplus sp. nov., Aleiodes basipunctatus sp. nov., Aleiodes basistriatus sp. nov., Aleioides binkyi sp. nov., Aleiodes biscutus sp. nov., Aleiodes bobwhartoni sp. nov., Aleiodes brevimedius sp. nov., Aleiodes brunniguttatus sp. nov., Aleiodes butcheri sp. nov., Aleiodes buzuriduplus sp. nov., Aleiodes buzuriquadruplus sp. nov., Aleiodes buzuritriplus sp. nov., Aleiodes calicis sp. nov., Aleiodes calvus sp. nov., Aleiodes canus sp. nov., Aleiodes caprinus sp. nov., Aleiodes castaneus sp. nov., Aleiodes centralis sp. nov., Aleiodes chamba sp. nov., Aleiodes chenduplus sp. nov., Aleiodes cheni sp. nov., Aleiodes codon sp. nov., Aleiodes complexus sp. nov., Aleiodes concoronarius sp. nov., Aleiodes conina sp. nov., Aleiodes connudatum sp. nov., Aleiodes conpectenus sp. nov., Aleiodes constriatum sp. nov., Aleiodes contemptus sp. nov., Aleiodes coronopus sp. nov., Aleiodes corrusciput sp. nov., Aleiodes cramum sp. nov., Aleiodes curtivena sp. nov., Aleiodes curvicauda sp. nov., Aleiodes damus sp. nov., Aleiodes darlingtonia sp. nov., Aleiodes deathi sp. nov., Aleiodes definus sp. nov., Aleiodes deyoyoi sp. nov., Aleiodes dimorphus sp. nov., Aleiodes divergerus sp. nov., Aleiodes downeyi sp. nov., Aleiodes eadyi sp. nov., Aleiodes elongatus sp. nov., Aleiodes etvalinus sp. nov., Aleiodes faciei sp. nov., Aleiodes flannelfooti sp. nov., Aleiodes flavostriatus sp. nov., Aleiodes fovodeum sp. nov., Aleiodes fuscomedius sp. nov., Aleiodes gaga sp. nov., Aleiodes gaspodei sp. nov., Aleiodes georgiae sp. nov., Aleiodes glabribasalis sp. nov., Aleiodes globofemurus sp. nov., Aleiodes glutinum sp. nov., Aleiodes griseimaculatus sp. nov., Aleiodes guidaae sp. nov., Aleiodes hei sp. nov., Aleiodes helenhippersonsae sp. nov., Aleiodes herrena sp. nov., Aleiodes hircus sp. nov., Aleiodes incisus sp. nov., Aleiodes jimwhitfieldi sp. nov., Aleiodes kitchingi sp. nov., Aleiodes klopfsteinae sp. nov., Aleiodes lavaeolous sp. nov., Aleiodes lemniscus sp. nov., Aleiodes liessa sp. nov., Aleiodes lipwigduplicitus sp. nov., Aleiodes lipwigi sp. nov., Aleiodes lobocarinus sp. nov., Aleiodes longivena sp. nov., Aleiodes macroophthalmus sp. nov., Aleiodes maculiput sp. nov., Aleiodes magratae sp. nov., Aleiodes malarius sp. nov., Aleiodes malichi sp. nov., Aleiodes mediofuscus sp. nov., Aleiodes mediomaculatus sp. nov., Aleiodes megaophthalmos sp. nov., Aleiodes mellificus sp. nov., Aleiodes mericeti sp. nov., Aleiodes microophthalmos sp. nov., Aleiodes molecryptus sp. nov., Aleiodes morti sp. nov., Aleiodes mutilus sp. nov., Aleiodes nathismus sp. nov., Aleiodes necsubson sp. nov., Aleiodes niveni sp. nov., Aleiodes nivori sp. nov., Aleiodes nonicones sp. nov., Aleiodes occimaculatus sp. nov., Aleiodes opus sp. nov., Aleiodes orion sp. nov., Aleiodes paenicarinus sp. nov., Aleiodes pallimedius sp. nov., Aleiodes palmae sp. nov., Aleiodes palmatipes sp. nov., Aleiodes parabuzurae sp. nov., Aleiodes parasongsi sp. nov., Aleiodes parisaae sp. nov., Aleiodes paulmarshi sp. nov., Aleiodes pectopulicis sp. nov., Aleiodes pectunguis sp. nov., Aleiodes pectunguisella sp. nov., Aleiodes penultimoluteus sp. nov., Aleiodes phantasmatis sp. nov., Aleiodes pinnulae sp. nov., Aleiodes placidus sp. nov., Aleiodes polititergus sp. nov., Aleiodes ponderi sp. nov., Aleiodes postmaculus sp. nov., Aleiodes prillae sp. nov., Aleiodes probuzurae sp. nov., Aleiodes procarinatus sp. nov., Aleiodes procoronarius sp. nov., Aleiodes pronopus sp. nov., Aleiodes propodealis sp. nov., Aleiodes propodocarinus sp. nov., Aleiodes protocastaneus sp. nov., Aleiodes pseudicones sp. nov., Aleiodes pteppicymoni sp. nov., Aleiodes ptraci sp. nov., Aleiodes rectanguliguttatus sp. nov., Aleiodes reticulisoma sp. nov., Aleiodes reus sp. nov., Aleiodes ridcullyi sp. nov., Aleiodes rincewindi sp. nov., Aleiodes risaae sp. nov., Aleiodes rivulus sp. nov., Aleiodes rufomedius sp. nov., Aleiodes rugoscutus sp. nov., Aleiodes sacharissa sp. nov., Aleiodes scottshawi sp. nov., Aleiodes selachiii sp. nov., Aleiodes sesquipunctatus sp. nov., Aleiodes similicodon sp. nov., Aleiodes songsi sp. nov., Aleiodes sophieae sp. nov., Aleiodes stibbonsi sp. nov., Aleiodes stohelit sp. nov., Aleiodes subemarginatus sp. nov., Aleiodes subfuscomedius sp. nov., Aleiodes submediofuscus sp. nov., Aleiodes subson sp. nov., Aleiodes sutthisani sp. nov., Aleiodes synorion sp. nov., Aleiodes teatimei sp. nov., Aleiodes tetrarugulosus sp. nov., Aleiodes thirakupti sp. nov., Aleiodes tmaliaae sp. nov., Aleiodes tobiasi sp. nov., Aleiodes transvena sp. nov., Aleiodes tricoloripes sp. nov., Aleiodes trisphaeropyx sp. nov., Aleiodes tulipus sp. nov., Aleiodes turgidipalpus sp. nov., Aleiodes valinus sp. nov., Aleiodes variifemurus sp. nov., Aleiodes vetinarii sp. nov., Aleiodes vietuput sp. nov., Aleiodes yalaensis sp. nov. and Aleiodes zuburae sp. nov., and three of the subgenus Arcaleiodes (viz. Aleiodes dresdeni sp. nov., Aleiodes (Arcaleiodes) vanachterbergi sp. nov. and Aleiodes (Arcaleiodes) siamensis sp. nov.) are described as new. An illustrated identification key provided, and some novel and hardly used characters are discussed and illustrated. Morphological and molecular comparison of these species with the better-known Holarctic fauna shows that several previously unrecognised species groups may be distinguished. Based on the Chao 1 diversity estimator, which additionally takes into account the number of specimens represented by precisely one, and the number represented by precisely two individuals, it is estimated that when fully known, the Thai fauna includes at least 438 species of Aleiodes.