Kazlıuşağı is a village in Şefaatli District, in Yozgat Province, Türkiye. Kazlıuşağı lies at 984 m above sea level, 9.7 km from the Anatolian plateau mountains. It has 187 inhabitants. The nearest city is Yerköy, 28 km to the northwest. Among the landmarks around are Şefaatli Clock Tower (4.4 km).