Аннотация:The monograph was written on the basis of the lectures course which author read on Physics department of Moscow state university. The physics properties of magnetic semiconductors(monooxide and monochalcogenides of europeum, chalcogenides spinels and manganites) are written. Giant effects observed in these materials are written in detail. This is the colossal magnetoresistence, the giant volume magnetostriction, the giant red displacement of the optic edge et al and their connection with magnetic order. The monograph to count on the students of old courses and post graduates specialized in the solid state physics. It has interest for specialists worked on research and application of new magnetic materials in radioelectronics and computer technics.