English pronunciation is one of the most important and complicated parts of foreign language teaching and learning. Due to its complexity, pronunciation has been overlooked in English language teaching. Understandable pronunciation is an important part of communicative competence. Individuals who have acceptable pronunciation can easily improve their language skills better than those who have weak pronunciation. Thus, English pronunciation is very significant for successful communication. This study investigated the factors influenced Iranian EFL learners’ English pronunciation learning. To this end, fifty Iranian EFL learners participated voluntarily in this study. A quantitative method was used as the design of this study. The researchers used a survey questionnaire as the instrument of this study. The collected data were analyzed via using frequency and percentage. The findings of this research indicated that factors such as pronunciation instruction, attitude, motivation, and error correction respectively were the most important factors that had the greatest effects on Iranian learners’ pronunciation improvement. It was also concluded that when teaching pronunciation into their classes, EFL teachers and learners should be equipped with these factors that can considerably increase their success in the correct teaching and learning of English pronunciation.
