Resistant hypertension is a serious condition in which blood pressure remains uncontrolled despite using three or more antihypertensive medications in different classes. Resistant hypertension can lead to chronic kidney disease and cardiovascular diseases. One of the main causes of resistant hypertension is OSA. Based on research study, prevalence of OSA in resistant hypertension patients up to 83%. After reviewing previous research articles, it was found that there is an association between OSA and resistant hypertension.