This paper addresses Iranian English as Foreign Language teachers and learners' perceptions of explicit grammar instruction and corrective feedback and the effect of language background on learners' perceptions of explicit grammar teaching. The research background indicates that explicit instruction and corrective feedback can play a significant part in the second language development. However, the extent to which their perceptions of the variables in the light of linguistic differences and learners' language proficiency levels differ towards them remains a gap in the literature. To fill it, the study was conducted involving totally 360 Iranian Azeri and Persian EFL learners along with 100 teachers possessing the similar language backgrounds. Both groups received a validated questionnaire of Perceptions towards grammar instruction and corrective feedback. The respective data were analyzed non-parametrically such that the results revealed both the learners and the teachers held significantly different perceptions towards the grammar instruction. The differences mainly attributed to their language backgrounds affecting the way they perceive the world including education. The Persian EFL learners held more positive views than the Azeri EFL learners. They also hold a more neutral view. The findings of the present study contribute to the field of second language teaching. The findings may improve our understanding of grammar development and corrective feedback and enable us to incorporate effective methods of teaching grammar in the EFL classrooms through considering learners' linguistic background and the context in which the target language is being taught.