Mpanjaka grandidieri is a moth of the family of Erebidae that is found in Central Madagascar. The wings are mouse-grey, sparkled with black atoms and crossed by 4 zig-zag white stripes. The body is whitish-brown and sandy-reddish behind the collar. The abdomen with blackish dorsal spots. The antennae are white, black speckeled with dark-brown pectinations. The male has a wingspan of 53 mm. This species was described by a specimen from Ankafana, central Madagascar.