Information on condition, growth and reproduction was collected from a sample of 85 male lechwe from the Linyanti Swamp in northern Botswana. No significant seasonal variation in condition was found in lechwe males. Von Bertalanffy equations were used to document growth in body‐mass, body‐length, chest girth, shoulder height, neck girth and horn length. Spermatogenesis occurred by 1.5 years of age after attainment of a body‐mass > 55 kg, a testis‐mass > 15 g and a semeniferous tubule diameter > 120 μm. There was an hiatus of perhaps three years between the onset of spermatogenesis and successful mating. In relation to condition, growth and reproduction, a number of sexual differences were documented, which were attributed to differences in the demands of reproduction and in reproductive strategies. Keywords: condition, growth, reproduction, seasonality, sexual maturity.