The study aimed to identify the role of emotional intelligence in academic achievement in the Arabic language among eleventh-grade students in post-basic schools in the Sultanate of Oman. The study also investigated any possible statistically significant differences in the role of emotional intelligence on academic achievement due to the gender variable. A descriptive research approach was implemented to achieve the objectives of the study. The study targeted eleventh-grade students in the North Al Batinah Governorate (N = 8636); however, a sample size of 337 students was randomly selected. The results of the study showed that the role of emotional intelligence in the academic achievement of eleventh-grade students in the Sultanate of Oman came to a high degree, with an average score of 3.81. The results also indicated that there were statistically significant differences at the significance level of 0.05≥α in favour of the female students. In light of these results, the study recommended the development of emotional intelligence skills among students and teachers to improve the teaching process and develop its outputs.