Lesson plan is a written description of education process in which it is shown what, when, where and with which method learners should learn and how they should be assessed. Lesson plan is one of the key factors in the educational process. According to the literature available, unfortunately few studies have been conducted on this issue in the context of Iran. Therefore, the effect of EFL teachers' attitudes towards lesson planning on improving teaching process seems to be neglected to some extent. With regard to this gap, the present study was an attempt to survey 93 English teachers' views concerning lesson plan at secondary high schools and institutions. Participants in this study answered a Modified Questionnaire, adopted from Ramaila et al. (2014). This Questionnaire was used to measure teachers' attitudes towards lesson planning and the degree of educational differences among them. Data analysis was done by utilizing descriptive statistics and T-test. The results showed that English teachers agreed with utilizing lesson plan. No significant difference was observed among teachers' views concerning the given variable. The findings revealed that due to the importance of lesson plan, holding specialized workshops may provide information for developing better course plans.