The synthesis of SnO2 nanostructures has gathered a substantial interest because of its distinctive assets and wide range of applications. SnO2 nanostructures are used in numerous fields including gas sensing, electronics, photocatalysis, and energy storage. In this chapter, we are reporting an environmentally sustainable, additive-free, and rapid synthesis of SnO2 nanostructures. The chapter focuses on the several methodologies including hydrothermal and solvothermal methods, sol–gel processes, chemical vapor deposition, and template-assisted techniques. We will discuss advantages and limitations for all processes, along with the influence of synthesis parameters on the morphology and properties of the resulting nanostructures. Moreover, the grave factors affecting the stability and performance of SnO2 nanostructures in practical applications are also explored in this chapter. Recent emerging trends and advancements in the synthesis of SnO2 nanostructures are highlighted by providing insight into future research directions in this dynamic field. Hydrothermal and solvothermal methods are highlighted for their capacity to resist the crystal growth and morphology under mild conditions. Sol–gel processes are distinguished for their simplicity and capability to yield high-purity SnO2. Chemical vapor deposition is known for manufacturing high-quality films and nanostructures with outstanding consistency over it necessitates high temperatures and erudite equipment. Template-assisted technique enables the production of SnO2 nanostructures with detailed geometrical control which make them appropriate for applications demanding explicit shapes and sizes. This chapter surveys the impact of synthesis parameters including pH, reaction time, temperature, and precursor concentration on the assets of SnO2 nanostructures.