Abstrak: Kecacingan termasuk dalam 11 dari 20 jenis Neglected Tropical Disease (NTD) atau penyakit tropis terabaikan yang terdapat di Indonesia. Angka kecacingan di Indonesia tahun 2012 adalah 22,6%.Kecacingan menimbulkan mual, kembung dan diare, anemia, kurang gizi, mudah sakit, kurang aktif dan lemas, sehingga berpengaruh pada intelegensi question (IQ) anak. Tujuan penelitian ini adalah untuk mengetahui hubungan Kejadian kecacingan dengan prestasi belajar siswa. Jenis penelitian ini adalah kuantitatif dengan desain cross sectional. Objek penelitian ini adalah semua siswa kelas 1 SD sebanyak 30 orang. Penelitian dilaksanakan pada 9-12 Juni 2014. Hasil penelitian menunjukkan bahwa siswa yang mengalami kejadian kecacingan sebanyak 8 siswa (26,7%) dengan jenis cacing gelang (Ascaris Lumricoides) sebesar 100%. Prestasi belajar siswa kurang baik sebanyak 20 siswa (66,7%). Ada hubungan kejadian kecacingan dengan prestasi belajar siswa dengan  p value 0,029 dengan OR=1,8 artinya responden menderita kecacingan berisiko 1,8 memiliki prestasi belajar kurang baik dibandingkan responden yang tidak menderita kecacinganKata kunci: Kecacingan, Prestasi Belajar, SiswaWORMY AS ONE OF CAUSATIVE FACTOR REVERSE LEARNING STUDENT ACHIEVEMENTAbstract: Worms included in 11 of the 20 types of Neglected Tropical Disease (NTD) or the neglected tropical diseases found in Indonesia. Figures worms in Indonesia in 2012 was 22.6%. worms can cause nausea, bloating and diarrhea, anemia, malnutrition, illness-prone, less active and limp, so the effect on the question of intelligence (IQ) of children. The purpose of this study was to determine the relationship between worm infection and incidence of student achievement. This type of research is quantitative with cross sectional design. The object of this study is all students of elementary school in grade 1 as many as 30 pupils. The experiment was conducted on June 9 to 12, 2014. The results showed that students who experience worm disease incidence as much as 8 students (26.7%) with the type of Ascaris Lumricoides are 100%. less student achievement by 20 students (66.7%). There is correlate between the incidence of worm infection and student achievement in elementary school Grade 1with p value 0.029 with OR = 1.8 means that the respondent suffered a 1.8-risk worm disease have poor learning achievement than those who did not suffer from worm infectionKeywords: Worms, Achievement, Student