Thirteen species of Teuchophorus (Dolichopodidae: Sympycninae) are reported from Singapore. Nine species are new to science and are described and illustrated. Only one species from the T. conspicuus - notabilis group was found: T. ornatulus Meuffels & Grootaert. Three species belong to the T. gratiosus group (former genus Mastigomyia Becker) that is supposed to be arboricolous: T. temasek, new species, T. neesoonensis, new species, and T. antennatus, new species, T. spinulosus new species, and T. acuminatus, new species. T. pauper from Thailand is re-examined and illustrated. Three species belong to the T. pectinatus group and all live here in mangrove: T. simplicissimus Meuffels & Grootaert, T. limosus, new species, T. bulohensis, new species. Two species are considered incertae sedis and not assigned to a species group: T. krabiensis Meuffels & Grootaert, a species from coastal sandy beaches and T. stenostigma Meuffels & Grootaert, a species from stream beds in forest. A key is given for all Singaporean species. In addition, some records of species from Malaysia are given and a mangrove species from Pulau Tioman (Malaysia) related to Singaporean mangrove species is described as well.
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