Novosedly nad Nežárkou lies on the Nežárka river, approximately 15 kilometres (9 mi) south-west of Jindřichův Hradec, 29 km (18 mi) north-east of České Budějovice, and 116 km (72 mi) south of Prague.
Administrative parts
The villages of Kolence and Mláka are administrative parts of Novosedly nad Nežárkou.