Multivalent aqueous-ion batteries represent a versatile and sustainable class of energy storage systems that utilize water-based electrolytes and multivalent charge carriers such as Zn²⁺ and Al³⁺. These systems offer intrinsic safety, environmental friendliness, and the potential for high volumetric energy density owing to the multiple-electron transfer capability of multivalent ions. The research emphasizes understanding ion transport mechanisms, designing stable electrode–electrolyte interfaces, and developing cost-effective materials compatible with aqueous environments. By integrating electrochemical efficiency with environmental sustainability, multivalent aqueous-ion batteries hold significant promise for safe, low-cost, and scalable energy storage solutions.