The aim of the current study was investigating the role of achievement in learning English as a foreign language in EFL learners' cheating attitudes and cheating behaviors. Eight hundred junior high-school students were selected based on random cluster sampling and participated in the study. Their attitudes towards academic dishonesty and their cheating behaviors in language classes were examined by two questionnaires. The result of data analysis revealed significant correlations between achievement in learning English and cheating attitudes and behaviors. Further, the result of regression revealed that achievement in learning English had weak power to predict cheating attitudes (0.7%). However, the power of achievement in learning English to predict cheating behaviors of language learners in language classes was five times stronger (3.5%).