ABSTRAK Tujuan penelitian ini untuk mengetahui bentuk kegiatan yang dilakukan ekstrakurikuler KIR SMK Negeri 1 Mojosongo yang dapat menguatkan kreativitas dan berpikir kritis pada anggota KIR. Penelitian ini menggunakan metode penelitian deskriptif kualitatif. Strategi penelitian ini menggunakan pendekatan studi analisis. Subjek penelitian ini adalah waka kesiswaan, pembina, dan anggota ekstrakurikuler kelompok ilmiah remaja. Teknik pengumpulan data meliputi observasi, wawancara dan dokumentasi. Uji keabsahannya menggunakan triangulasi sumber dan triangulasi metode. Data penelitian dianalisis menggunakan teknik deskriptif kualitatif dengan model analisis interaktif. Hasil penelitian ini dapat disimpulkan bahwa bentuk kegiatan yang dilakukan di ekstrakurikuler KIR meliputi kegiatan penelitian dan perlombaan. Dalam tahapan kegiatan penelitian telah memuat kelima indikator penguatan berpikir kritis yaitu ketrampilan menganalisis pada kegiatan pengujian, ketrampilan mensintesis/menggabungkan pada kegiatan perolehan informasi dari jurnal, ketrampilan memecahkan masalah, ketrampilan menyimpulkan serta ketrampilan mengevalusi pada setiap tahapan penelitian. Selain itu kreativitas para anggota selalu diasah dengan kegiatan penemuan ide/tema penelitian yang akan dilakukan. Kata Kunci : Kreativitas, Berpikir Kritis, Kelompok Ilmiah Remaja ABSTRACT The purpose of this study was to determine the form of extracurricular activities carried out by SMK N 1 Mojosongo KIR which can strengthen creativity and critical thinking in KIR members. This research method was a qualitative descriptive method. The research strategy used was an analysis study. The subjects of this study were the vice principal of student affairs, the supervisor, and members of the extracurricular youth scientific group. Data collection techniques include observation, interviews and documentation. The validity test of the data used was by using source triangulation and method triangulation. The research data was analyzed using qualitative descriptive techniques with an interactive analysis model. The results of this study could be concluded that the forms of activities carried out in the KIR extracurricular were research and competition activities. In the research activity stage, there are 5 indicators of strengthening critical thinking such as analytical skills in testing activities, synthesis skills/combining information acquisition activities from journals, problem-solving skills, conclusion skills and evaluation skills for each stage of the research. In addition, the creativity of the members is always honed through activities to find ideas/themes for research to be carried out. Keywords : Creativity, Critical Thinking, Youth Scientific Group