Idiopathic anterior uveitis is the most common form of anterior uveitis. This group does not have any reasons and is then called idiopathic. After examining the posterior segment and ruling out masquerade syndromes and infections, the main step of diagnosis is clinical characterization. It is essential to establish the presence or absence of unilateral versus bilateral and granulomatous features. Subsequently, a directed work-up may be obtained which then helps to confirm diagnostic hypotheses based on the detailed history and clinical examination. Treatments are adapted according to etiology and disease severity. Here, idiopathic and granulomatous anterior uveitis is reviewed.