Kalju

Kalju may refer to:
 * Kalju, Lääne County, village in Lääne-Nigula Parish, Lääne County
 * Kalju, Saare County, village in Saaremaa Parish, Saare County
 * Kalju (given name), Estonian male given name
 * JK Nõmme Kalju, football club based in Nõmme, Tallinn