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Salinity is one of the world’s most pressing environmental problems that has affected nearly one-third of the world’s cultivated land. Ionic toxicity, osmotic stress, and nutritional defects under severe salt stress may lead to metabolic imbalances and resultant oxidative stress. Amaranthus spp. have been cultivated for centuries as a grain and foliage crop in many parts of the world due to the high nutritional value of its leaves and seeds as well as its resistance against both biotic and abiotic stresses like heat, drought, diseases, and pests. Many species of the genus have been reported to tolerate adverse environmental stresses which have been associated with their C₄ physiology, indeterminate flowering habit, long tap root system, extensive lateral root system, accumulation of compatible solutes, efficient water usage, and the expression of stress-related genes and transcription factors. This chapter presents an …