The magnetoresistive&rgr;(T,H)and thermoelectric (the Seebeck coefficient)S(T,H)properties ofLa0.7□0.3MnO3−&dgr;thin films (□ is a cation vacancy) grown by the magnetron deposition technique are investigated. The magnetic polaron origin of the conductivity of such systems is established in the temperature range77 K⩽T⩽350 Kin magnetic fields0⩽H⩽10 kOe.The experimental dependences&rgr;(T,H)andS(T,H=0)are approximated by a universal phenomenological expression. Thermopower measurements indicate a considerable change of the mobility as well as the density of states of charge carriers in the region of magnetic phase transition. ©1998 American Institute of Physics.