This quasi-experimental research with one group pretest-posttest design aimed to know the effectiveness of socrates contextual learning viewed by students critical thinking ability. The population of this research was all students of grade VII of SMP Al-Kautsar Bandarlampung in academic year of 2014/2015. The sample of this research was students of VIIB class that was chosen by purposive sampling technique. The data of this research were collected by students critical thinking ability test which were analyzed by the paired sample t-test and proportion test. Based on the result of this research, it was concluded that socrates contextual learning was effective viewed by students mathematical critical thinking ability.Penelitian eksperimen semu dengan desain one group pretest-posttest ini, bertujuan untuk mengetahui efektivitas pembelajaran socrates kontekstual ditinjau dari kemampuan berpikir kritis siswa. Populasi penelitian ini adalah seluruh siswa kelas VII SMP Al-Kautsar Bandarlampung tahun pelajaran 2014/2015. Sampel penelitian ini adalah siswa kelas VII B yang dipilih dengan teknik purposive sampling. Data penelitian diperoleh melalui tes kemampuan berpikir kritis matematis siswa yang dianalisis menggunakan paired sample t-test dan uji proporsi. Berdasarkan hasil penelitian ini, diperoleh kesimpulan bahwa pembelajaran socrates kontekstual efektif ditinjau dari kemampuan berpikir kritis matematis siswa.Kata kunci: efektivitas, kemampuan berpikir kritis, socrates kontekstual