the present study aimed to investigate the possible effects of focused highlighted error feedback on grammatical accuracy of writing among iranian intermediate efl learners. after selecting 52 homogenous participants from among 70 university students attending azad university of rasht and randomly dividing them into two intact groups of 26 students, the researcher exposed the participants of the experimental group to 12 sessions of the intended treatment. during the treatment sessions, the said individuals were exposed to focused feedback upon the submission of the drafts of their essays; in comparison, the subjects in the control group, upon the submission of their essays, were corrected using traditional approaches. after the completion of the study and performing the due data analysis on the results, a significant progress was found among the subjects in the experimental group as compared to the control group. key words: focused feedback, written corrective feedback, essay writing abstract the present study aimed to investigate the possible effects of focused highlighted error feedback on grammatical accuracy of writing among iranian intermediate efl learners. after selecting 52 homogenous participants from among 70 university students attending azad university of rasht and randomly dividing them into two intact groups of 26 students, the researcher exposed the participants of the experimental group to 12 sessions of the intended treatment. during the treatment sessions, the said individuals were exposed to focused feedback upon the submission of the drafts of their essays; in comparison, the subjects in the control group, upon the submission of their essays, were corrected using traditional approaches. after the completion of the study and performing the due data analysis on the results, a significant progress was found among the subjects in the experimental group as compared to the control group.