Banyaknya pengguna media sosial di Indonesia berpotensi untuk mengendalikan masalah epidemiologi global termasuk obesitas. Apakah grup yang dibentuk di media social, yang terdiri dari orang yang tidak saling mengenal, namun karena adanya kesamaan ketertarikan menurunkan berat badan, akan membantu meningkatkan motivasi anggota-anggota grupnya?. Penelitian ini bertujuan untuk mencari hubungan dukungan teman di media sosial dengan peningkatan motivasi dalam penurunan berat badan. Penelitian ini bersifat deskriptif analitik, dengan desain cross sectional. Sampel berjumlah 110 orang yang dipilih menggunakan teknik purposive sampling. Instrumen penelitian diadopsi dari Treatment Self-Regulation Questionnaire (TSRQ) dan kuesioner Ballatine. Hasil penelitian menunjukkan 88,2% responden adalah perempuan, 85,5% berusia 20-40 tahun, sebagian besar ibu rumah tangga (50,9%), periode bergabung dengan kelompok pada media sosial antara 1-4 bulan (45,5%) . Sekitar 49,1% responden merasa sangat didukung dan termotivasi oleh anggota dalam sesama grup di media sosial. Hasil uji statistik menunjukkan bahwa ada hubungan antara dukungan sosial dengan motivasi penurunan berat badan (pValue 0,019). Studi ini menunjukkan bahwa grup di media sosial dapat membantu menjaga motivasi anggota mereka untuk melaksanakan diet. Dianjurkan agar tenaga promosi kesehatan menggunakan media sosial sebagai alternatif konsultasi, edukasi program-program kesehatan. Kata kunci: Dukungan sosial, Kelompok Diet, Obesitas, Media Sosial SOCIAL SUPPORT FOR DIET COMMUNITIES IN SOCIAL MEDIAThe number of users of social media in Indonesia has the potential to control global epidemiological problems including obesity. Does the group formed on social media, that consists of people who do not know each other, but because of the similarity of interest in losing weight, will help increase the motivation of the group members? The purpose of this study was to find a relationship between friend support on social media with increased motivation in weight loss. This research is descriptive analytic, with cross sectional design. A sample of 110 people was selected using a purposive sampling technique. The research instrument was adopted from the Treatment Self-Regulation Questionnaire (TSRQ) and the Ballatine questionnaire. The results showed 88.2% of respondents were women, 85.5% were aged 20-40 years, most were housewives (50.9%), the period of joining groups on social media between 1-4 months (45.5%). About 49.1% of respondents felt strongly supported and motivated by members in fellow groups on social media. The statistical test results show that there is a relationship between social support and motivation for weight loss (pValue 0.019). This study shows that groups on social media can help maintain the motivation of their members to carry out a diet. It is recommended that health promotion personnel to use social media as an alternative to disseminating health program information.