Objective: To evaluate the cascade of HIV care in Oman in 2018 and the longitudinal change in each step from 2015 to 2018. Methods: Population-based data on all diagnosed people living with HIV reported to the National AIDS Programme in 1984–2018 were used. Results: As of December 31, 2018, the estimated number of people living with HIV in Oman was 3030; 1532 (50.6%) were aware of their infection. Of the diagnosed patients, 95.9% were linked to care, 85.8% were retained in care, and 84.3% were on ART. The proportions of patients with viral suppression out of all people with HIV, the diagnosed persons, and those on ART were 37.3%, 73.7%, and 87.5%, respectively. The proportion of patients linked to care increased from 72.6% in 2015 to 95.6% in 2018 (p