质子加速器是一类用于将带正电的质子加速到高能量的装置，依靠交变电场做功、磁场引导束流。
常见类型包括回旋加速器、同步加速器和线性加速器（linac），现代系统多采用射频腔产生高频电场并用磁体聚束与弯曲轨迹。
质子束具有布拉格峰特性，可在特定深度释放最大能量，因而在肿瘤放疗中用于精确杀伤肿瘤、保护周围组织；在基础物理中用于碰撞实验探究强相互作用与核结构；在工业上用于同位素制备、材料改性与辐照试验。
挑战包括设备体积大、造价高、对屏蔽与安全控制要求严格，以及对加速稳定性和束流质量的高要求。
未来发展方向着重小型化（如高场磁体、超导技术）、激光等离子体加速方法、以及更灵活的加速-输送一体化系统，以降低成本并拓宽临床与产业应用。
总体来看，质子加速器在科学与医疗领域具有重要价值，技术进步将推动其更加普及和高效。
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