Lemdeyya neɣ Lemdiyyet (Taɛrabt : المدية,Tafrensist : Médéa) d yiwet tamdint n Lezzayer deg temnaṭ n Tiṭri di tama n Waṭlas Ablidi. Yerna, tamdint n Lemdeyyet d adel-aɣella (chef-lieu) n twilayt n Lemdeyyet. Deg 2008, zedɣen-tt azal n 138,355 imezdaɣen. Tarakalt Asideg (timella) Lemdeyyet tezga-d ar 50 km ɣer Lexmis n Tmelyant, 24km ar wenẓul seg Leblida d 80km ar ugafa seg Qṣer Lbuxari. Taɣiwant-a tusa-d ar ugafa-utrim (nord-ouest) n twilayt.