Stridor is a relatively common condition in pediatrics and causes considerable anxiety to the caretakers. It requires great clinical acumen to make the most possible diagnosis. Most cases can be diagnosed by meticulous examination and carefully selected investigations. Sound knowledge of the various conditions that could present with stridor is essential to provide the best possible management. This chapter will guide the clinicians to make confident diagnosis of the various conditions that presents with stridor in order to provide the best possible treatment.