Berdasarkan data awal melalui kuesioner yang diisi oleh guru Kimia di MGMP Kabupaten Barito Kuala (Batola) diperoleh bahwa (1) pemahaman guru tentang pembelajaran Science, Technology, Engineering, and Mathematics (STEM) berada pada kategori cukup sebanyak 70,6%; (2) pemahaman guru tentang pembelajaran berdiferensiasi berada pada kategori cukup sebanyak 58,8%; dan (3) pemahaman guru tentang penyusunan rencana pembelajaran Kurikulum Merdeka berada pada kategori cukup sebanyak 64,7%. Masalah yang ditemukan ini perlu diatasi oleh tim Program Dosen Wajib Mengabdi (PDWA) dengan memberikan pelatihan pembelajaran berdiferensiasi melalui penyusunan bahan ajar kimia berbasis STEM di lingkungan lahan basah dalam Kurikulum Merdeka bagi guru Kimia di MGMP Kabupaten Barito Kuala. Tujuan kegiatan ini ialah memberikan pengetahuan dan keterampilan kepada guru kimia tentang penyusunan bahan ajar kimia berbasis STEM di lingkungan lahan basah dalam Kurikulum Merdeka. Kegiatan ini dilakukan 3 kali pertemuan yaitu 1 kali pertemuan secara online pada tanggal 21 Juli 2023 dan 2 kali pertemuan secara offline pada tanggal 29 Juli dan 4 Agustus 2023. Adapun metode yang gunakan ada 4 tahap yaitu tahap analisis, tahap perencanaan, tahap pelatihan dan tahap evaluasi. Berdasarkan hasil angket evaluasi kegiatan maka dapat disimpulkan bahwa guru dapat menyusun bahan ajar kimia berbasis STEM dengan memperoleh nilai sebesar 72,44% termasuk kategori paham. Pelatihan ini dapat meningkatkan pengetahuan dan keterampilan guru kimia dalam menyusun bahan ajar kimia berbasis STEM.Based on preliminary data through a questionnaire filled out by Chemistry teachers at MGMP Barito Kuala (Batola) Regency, it was found that (1) teachers' understanding of Science, Technology, Engineering, and Mathematics (STEM) learning was in the sufficient category at 70.6%; (2) teachers' understanding of differentiated learning is in the sufficient category at 58.8%; and (3) teachers' understanding of the preparation of Independent Curriculum learning plans is in the sufficient category at 64.7%. This problem needs to be addressed by the Compulsory Service Lecturer Program (PDWA) team by providing differentiated learning training through preparing STEM-based chemistry teaching materials in a wetland environment in the Independent Curriculum for Chemistry teachers at MGMP Barito Kuala Regency. This activity aims to provide chemistry teachers with knowledge and skills regarding preparing STEM-based chemistry teaching materials in wetland environments in the Independent Curriculum. This activity was carried out in 3 meetings: one online meeting on 21 July 2023 and 2 offline meetings on 29 July and 4 August 2023. The method used was four stages, namely the analysis stage, the planning stage, the training stage, and the evaluation. Based on the activity evaluation questionnaire results, it can be concluded that teachers can prepare STEM-based chemistry teaching materials by obtaining a score of 72.44%, including the understanding category. This training can improve chemistry teachers' knowledge and skills in preparing STEM-based chemistry teaching materials.