Abstrak Penelitian ini bertujuan mengungkap kontruksi materi, praksis pembelajaran, dan reproduksi pengetahuan sejarah kontroversial G-30-S/PKI, serta pertautan dengan konteks di luarnya, yaitu situasi masyarakat Indonesia pasca Reformasi dan fenomena era post truth. Metode penelitian kualitatif ekslporatif. Pengumpulan data dengan wawancara, observasi, dan studi dokumentasi. Data divalidasi dengan triangulasi sumber. Analisis data dengan analisis wacana kritis dari Fairclough. Hasil penelitian menemukan bahwa konstruksi materi G-30-S/PKI merepresentasikan situasi masyarakat Indonesia pasca Reformasi yang ditandai dengan dimasukannya berbagai versi serta digunakannya istilah G 30 S dan G-30-S/PKI sekaligus, namun dalam praksis pembelajaran dan reproduksi pengetahuan di masyarakat masih didominasi satu versi yang ditandai dengan penggunaan media film G-30-S/PKI dan sumber pengetahuan lain dalam versi yang sama. Terdapat pertautan antara wacana (teks/materi), praksis pembelajaran, dan reproduksi pengetahuan sejarah kontroversial Gerakan 30 September 1965 dengan konteks masyarakat Indonesia pasca Reformasi yang secara umum masih menyimpan memori traumatik tentang komunisme, faktor kebijakan pemerintah terhadap pendidikan sejarah, serta fenomena era post truth. Abstract This study aims to reveal the construction of materials, learning praxis, and reproduction of the controversial historical knowledge of the G-30-S/PKI, as well as the relationship with the context outside, namely the situation of post-Reformation Indonesian society and the phenomenon of the post-truth era. Explorative qualitative research method. Collecting data by interview, observation, and study documentation. Data were validated by triangulation of sources. Data analysis with critical discourse analysis from Fairclough. The results of the study found that the material construction of the G-30-S/PKI represented the situation of Indonesian society after the Reformation, which was marked by the inclusion of various versions and the use of the terms G 30S and G-30-S/PKI at once, but in the practice of learning and reproducing knowledge in society. still dominated by one version which is marked by the use of the G-30-S/PKI film media and other sources of knowledge in the same version. There is a link between discourse (text/material), learning praxis, and reproduction of controversial historical knowledge of the 30 September 1965 Movement with the context of post-Reformation Indonesian society, which in general still retains traumatic memories of communism, government policy factors for historical education, and the phenomenon of the post-truth era. .