Lázně Kynžvart (German: Bad Königswart, Königswart, Königswarte) is a spa town in Cheb District, Karlovy Vary Region, Czech Republic. It is located near a château of the same name (Kynžvart Castle). The Jewish Königswarter family originate in the town. Kynžvart is famous for its sanatorium, which is designed for children ages 2 to 15 with nonspecific respiratory disorders.