This paper investigated the impact of direct unfocused written corrective feedback (WCF) on EFL students’ writing improvement, self-efficacy, and anxiety. To this aim, 52 Iranian male learners were selected as participants by using the Oxford Placement Test and randomly placed in an experimental and a control group. The participants completed a pre-test that included a writing task, the writing self-efficacy questionnaire (WSEQ), and the Second Language Writing Anxiety Inventory (SLWAI) to assess their writing skill, writing self-efficacy, and writing anxiety, respectively. Having attended 15 sessions of writing instruction in which only the experimental group received WCF, the participants again completed a writing task, the WSEQ, and the SLWAI in the posttest procedure. The results showed that the experimental group outperformed the control group in all three constructs, indicating that WCF has a positive impact on EFL students’ writing performance, self-efficacy, and anxiety. Implications of the study are presented.