Feedback is a crucial element in writing instruction; however, its effectiveness is still debated among scholars. This study investigates the effectiveness of teacher and peer feedback in improving spelling and punctuation skills using a quantitative experimental design that involved two pre-intermediate writing classes at the International Maritime College Oman. Twenty-six participants were randomly selected from both classes. Students' spelling and punctuation errors were assessed using a pre-test–post-test design and data were analyzed using Microsoft Excel and SPSS. Results indicated that teacher feedback significantly improved both spelling and punctuation, whereas peer feedback improved punctuation but led to a decline in spelling. Overall, teacher feedback outperformed peer feedback in enhancing writing accuracy. Due to the small sample size and focus on academic essays, findings may not be generalizable. Future research should explore additional writing genres and include larger, more diverse participant groups.