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In this chapter the impact of corpus-based vocabulary teaching/learning on vocabulary retention among EFL learners with different levels of language proficiency is studied. Four groups of students (two experimental and two control) participated in the study. The experimental groups received vocabulary instruction based on the techniques and procedures of the lexical approach. The control groups were taught with conventional techniques of vocabulary teaching. Vocabulary learning and retention were assessed by two vocabulary tests taken immediately after the treatment and with a 2-month delay respectively. The result showed that the lower proficiency experimental group outperformed other groups in the first vocabulary test, while in the second vocabulary test no significant difference was found between the experimental groups with different language proficiencies.