Quantum criticality is a phenomenon that occurs at quantum critical point (QCP) and plays a vital role in the property of perovskite multiferroic materials which exhibit simultaneous magnetic and electric ordering. This chapter explores the concept of quantum criticality in context of sustainable perovskite multiferroics and how quantum fluctuations affect the ferroic properties of these materials near quantum critical points. This chapter also focuses on the behavior of properties such as magnetic, electric, and lattice degrees of freedom at quantum critical point and effect of quantum fluctuation on coupling of these properties and generation of new exotic phases in perovskites multiferroic materials. Furthermore, influence of composition, doping, and strain on quantum critical behavior of these materials with emphasis on scaling material properties for practical applications also discussed in the chapter. This addresses how quantum criticality is dominant concept in the development of environment friendly sustainable perovskite materials utilizing rich and nontoxic elements to enhance device efficiency and hence brightens the pathways for designing next-generation multiferroic materials. This may create a new revolution in designing low-power, high-performance, eco-friendly technologies in material science.