The present work entitled "MAGNETIC AND DIELECTRIC PROPERTIES OF SPINEL NANO MAGNETIC OXIDES" mainly deals with the structural, electrical, dielectric and magnetic properties of Co0.3Cu0.4Zn0.3Fe2-xAlxO4 and Co0.3Cu04Zn0.3Fe2-xCrxO4spinel ferrite systems prepared by standard ceramic technique. Chapter I Introduction: This chapter gives introduction to magnetism, kinds of magnetism, Composition and structure of ferrite, Types of spinel ferrite, Application of ferrites and Literature survey of ferrite and aim of the work. Chapter 2 Preparation and properties of ferrite: This chapter deals with the various preparative technique of ferrite and electrical and magnetic properties of ferrite. Chapter 3 Experimental Techniques: This chapter is devoted to the brief introduction of the experimental techniques which are used in the present work. Chapter 4 Results and Discussion of Co0.3Cu0.4Zn0.3Fe2-xAlxO4: This chapter presents the results obtained on Co0.3Cu0.4Zn0.3Fe2xAlxO4 spinel ferrite system and their discussion along with conclusions. Chapter 5: This chapter presents the experimental results obtained on Co0.3Cu04Zn0.3Fe2-xCrxO4 spinel ferrite system.