Penelitian ini bertujuan menganalisis faktor lingkungan biologis, keluarga, dan PHBS sebagai faktor yang berhubungan dengan balita gizi kurang. Desain penelitian crosssectional, dilaksanakan pada Maret-Mei 2013. Responden adalah ibu balita. Jumlah sampel 91 balita usia 12-59 bulan. Variabel yang berhubungan signifikan dengan gizi kurang adalah asupan energi (p value 0,024 dan OR 4,792), ASI eksklusif (p value0,039 dan OR 3,45), rutinitas menimbang di Posyandu (p value 0,016 dan OR 3,5),rutinitas cuci tangan dengan sabun (p value 0,012 dan OR 3,6) dan penggunaan jamban sehat (p value 0,04 dan OR 2,867). Rutinitas menimbang di Posyandu merupakan faktor dominan kejadian gizi kurang pada balita.Kata Kunci: gizi kurang, balita, lingkungan biologis, keluarga, PHBS

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The purpose of this study was to determine correlation of biological environment,family, and clean and healthy lifestyle factor on underweight of children under five.The cross sectional study design was conducted during March-Mei 2013. Therespondent were mothers of children. Total sampel were 91 children age 12-59months. Variables that significantly correlated with underweight were energy intake(p value 0,024 and OR 4,792), exclusive breastfeeding (p value 0,039 and OR 3,45),routinity of weighing in Posyandu (p value 0,016 and OR 3,5), routinity of washinghands with soap (p value 0,012 and OR 3,6) and using healthy latrine (p value 0,04and OR 2,867). Routinity of weighing in Posyandu was the dominant factor ofunderweight of children under five.Keywords: underweight, children under five, biological environment, family, lifestyle