95% of cheetahs in Namibia are found on private farmland. No information was available of any aspect of cheetah ecology on private farmland, all previous studies were done in reserves or other protected areas. Field work was started in February 1984 on 20 farms in one of the highest cheetah density and problem areas. During two years, 17 cheetahs were caught and marked with radio-collars. Field work was completed in August 1987. Homerange size was 800 km2 for males and 1500 km for females. The density was estimated to one cheetah per 50 km2. Diet was found to be mainly young calves of kudu, hartebeest and oryx. It was found that cheetah only took calves from birth to about 8 months, and on average only 3-4 calves per farm were taken by cheetahs. Males lived either solitarily or in groups of 2-5 males. Farmers in central and northern districts of the country view the cheetah as the major cause of livestock losses. The number of cheetahs being killed is increasing. The only possible way to ensure the future breeding population of cheetahs on farmland would be to raise the economic value of the animal for the farmer. Keywords: 1NA, Acinonyx jubatus, cheetah, ecology, field work, home range, hunting, population, density, population size, protected area, quota, radio-collar, survey, telemetry.