Seir

Seir or SEIR may refer to:


 * Mount Seir, a mountainous region stretching between the Dead Sea and the Gulf of Aqaba
 * Seir the Horite, chief of the Horites, a people mentioned in the Torah
 * Sa'ir, also Seir, a Palestinian town in the Hebron Governorate in the West Bank
 * Seir, a demon in the Ars Goetia
 * Southeast Indian Ridge (SEIR), is a mid-ocean ridge in the southern Indian Ocean
 * SEIR model, a compartmental model in epidemiology
 * Single-engine instrument rating, an aircraft pilot qualification