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Worms caused by Soil Transmitted Helminths are a group of intestinal nematode worms that infect through contact with parasitic eggs or larvae that grow on fertile and moist soil. Knowledge about helminthiasis has an important role to prevent helminthiasis, so the tendency of low knowledge will further increase the risk of helminthiasis. The purpose of this study was to determine the relationship of the level of knowledge, attitudes and actions of farmers to the incidence of Soil Transmitted Helminths infection in Dukuh Ngancan Desa Sobokerto Ngemplak Boyolali and the percentage of Soil Transmitted Helminth infections. This type of research uses observational methods with a cross-sectional approach. The sampling technique uses Simple Random Sampling. Data were collected from respondents using a questionnaire and faecal examination with Eosin 2% technique and Sedimentation technique. Data analysis using Chi-Square test analysis. The results showed that there was no correlation between the level of knowledge and actions of farmers against the incidence of Soil Transmitted Helminths infection in Dukuh Ngancan Desa Sobokerto Ngemplak Boyolali, but there was a relationship between farmers' attitudes toward the incidence of parasitic Soil Transmitted Helminths infection in Dukuh Ngancan Desa Sobokerto Ngemplak Boyolali and percentage of Soil Transmitted Transmission in Boyolali. Helminths of 44 respondents who were not infected with Soil Transmitted Helminths 95.5% and those infected with Soil Transmitted Helminths 4.5%.