摘要：The purpose of this research was to analyze the suitability of the material in the Geography textbook for Class XI Curriculum 2013 published by Mediatama based on the BSNP Textbook Criteria and the completeness of the 21st century (4C) skill components. This research uses qualitative research with a content analysis approach. The research subject used was the Geography textbook Class XI Curriculum 2013 Revised Edition published by Mediatama. The research subject was the Geography textbook for Class XI of the 2013 Curriculum, Revised Edition published by Mediatama. The data validity was done by triangulating the source. The research found that the books most used by the MGMP Sukoharjo were feasible (87,61%). Based on the results of the analysis, according to the material expert, chapter I has the highest aspect is creative thinking and communication aspects (100% completeness), chapter III is critical thinking, creative thinking and communication (100% completeness), chapter VII is critical and creative. think (100% complete). According to practitioners, chapter I is collaboration aspect (completeness 100%), chapter III creative thinking (completeness 85.7%), chapter VII critical thinking (completeness 89%). According to researchers, chapter I is creative thinking, communication, and collaboration (100% complete), chapter III and chapter VII are 100%. Penelitian ini bertujuan untuk menganalisis kesesuaian materi dalam buku teks Geografi Kelas XI Kurikulum 2013 Terbitan Mediatama berdasarkan Kriteria Buku Teks BSNP dan kelengkapan komponen keterampilan abad 21 (4C). Sejalan dengan tujuan maka penelitain ini menggunakan jenis penelitian kualitatif dengan pendekatan analisis isi. Subjek penelitian yang digunakan adalah Buku teks Geografi Kelas XI Kurikulum 2013 Edisi Revisi terbitan Mediatama. Pengumpulan data dalam penelitian ini dilakukan dengan cara wawancara secara langsung dan instrumen penelitian berupa kuesioner untuk ahli materi dan praktisi pembelajar (guru). Keabsahan data dilakukan dengan triangulasi sumber. Hasil penelitian menunjukkan bahwa buku yang paling banyak digunakan MGMP Sukoharjo dikatakan layak digunakan (87.61%). Berdasarkan analisis, menurut ahli materi bab I memiliki aspek tertinggi berfikir kreatif dan komunikasi (kelengkapan 100%), bab III berpikir kritis, kreatif dan komunikasi (kelengkapan 100%), bab VII berpikir kritis dan kreatif (kelengkapan 100%). Menurut praktisi bab I memiliki aspek tertinggi kolaborasi (kelengkapan 100%), bab III berpikir kreatif (kelengkapan 85,7%), bab VII berpikir kritis (kelengkapan 89%). Menurut peneliti bab I memiliki aspek tertinggi berpikir kreatif, komunikasi, dan kolaborasi (kelengkapan 100%), bab III dan bab VII dikatakan bahwa semua keterampilan abad 21 memiliki kelengkapan 100%.
