One known and three new Tylenchorhynchus species are described and illustrated from Namibia. Tylenchorhynchus kidwaii n. sp. is characterised by a continuous lip region with 7-9 annuli, moderately sclerotized cephalic framework, strong stylet with well-developed basal knobs, absence of longitudinal striae, regularly areolated lateral field, and cylindrical tail with broadly rounded, annulated terminus. Tylenchorhynchus namibiensis n. sp. is distinguished by a set off, rounded head, moderately developed stylet, distinct basal knobs, areolated lateral field, and presence of a postanal intestinal sac. Tylenchorhynchus spec. is distinguished by small body size, set off head, interrupted longitudinal striae in neck region, weakly developed stylet with distinct basal knobs, non-areolated lateral fields, and conoid tail with smooth terminus. Tylenchorhynchus brevilineatus Williams, 1960 is reported and described for the first time from Namibia. Keywords: Namibia, Namib Desert, Kuiseb River, arid environment, taxonomy, description, distribution, reproduction.