This study aims to explore the types and reasons for teachers' corrective feedback (CF) in English as a Foreign Language (EFL) classes from sociocultural perspectives. To do so, 12 Iranian EFL teachers were selected based on convenience sampling, and 18 sessions of their classes (one or two from each teacher) were observed to ensure that there were at least three CF occurrences in each teacher's class. Then, the teachers attended stimulated recall interviews in which they answered questions about reasons for applying specific CFs in their classes. Different subthemes emerged from the data within the three sociocultural mediators' themes, namely psychological, material and peer mediators. The results indicated that teachers use different CFs in their classes for various reasons such as scaffolding learning, enhancing noticing and exposure, and fostering learners' agency. The study ends with suggestions and implications for teachers and teacher educators.