Abstract. This study aims to improve teacher and students activities, creative thinking ability, self efficacy, and student learning outcomes in Colloid system material using creative problem solving model. The subjects were 36 students of grade XI IPA SMA PGRI 4 Banjarmasin. This classroom action research was conducted in 2 cycles through the stages of planning, action, evaluation and observation, and reflection. The data were collected using observation instruments, creative thinking skills tests, student achievement test, and questionnaires. Analysis of the data used qualitative and quantitative analysis techniques. The results of the cycle I and cycle 2 showed: (1) there was an increase in teacher and student activities from good to very good, (2) students' creative thinking ability increased from moderate to high, (3) self efficacy of students increased from moderate to high, (4) students' learning outcomes on the attitude aspects improved from good (score 71,53) to be very good (score 86.34), the skill aspects improved from good enough to good, and the percentage of students' mastery increased from 52.78% in the first cycle to 83.33% in te second cycle. Keywords: Creative problem solving, creative thinking ability, self efficacy, colloid system. Abstrak. Penelitian ini bertujuan untuk meningkatkan aktivitas guru dan aktivitas siswa, kemampuan berpikir kreatif, self efficacy, dan hasil belajar siswa pada materi sistem Koloid menggunakan model pembelajaran creative problem solving. Subjek penelitian adalah 36 orang siswa kelas XI IPA SMA PGRI 4 Banjarmasin. Penelitian tindakan kelas ini dilakukan dalam 2 siklus melalui tahap-tahap perencanaan, tindakan, evaluasi dan observasi, dan refleksi. Data dikumpulkan menggunakan instrumen observasi, tes kemampuan berpikir kreatif, tes hasil belajar, dan angket. Analisis data menggunakan teknik analisis kualitatif dan kuantitatif. Hasil penelitian siklus I dan siklus 2 menunjukkan: (1) terjadi peningkatan aktivitas guru dan aktivitas siswa dari baik menjadi sangat baik, (2) kemampuan berpikir kreatif siswa meningkat dari sedang menjadi tinggi, (3) self efficacy siswa menigkat dari sedang menjadi tinggi, (4) hasil belajar siswa pada aspek sikap meningkat dari baik (skor 71,53) menjadi sangat baik (skor 86,34), aspek keterampilan meningkat dari cukup baik menjadi baik, dan persentase ketuntasan pengetahuan siswa meningkat dari 52,78% pada siklus I menjadi 83,33% di siklus II.Kata kunci: creative problem solving, kemampuan berpikir kreatif, self efikasi, sistem koloid.