加斯佩半岛（法语：Gaspésie）位于加拿大魁北克省东部，北临圣劳伦斯河，南隔沙勒尔湾与雷斯蒂古什河与新不伦瑞克省相望，东北滨圣劳伦斯湾，长约240公里。位于半岛北部的希克秀克山脉（Shickshock Mountains）的雅克·卡蒂埃山（一译雅克·卡尔捷山，Mount Jacques Cartier）海拔1268米，为半岛最高点。半岛上河流众多，主要有卡斯卡皮迪亚河（Cascapédia River）、圣让河（St-Jean）、约克河等。沿海主要城市为马塔讷、加斯佩、佩尔塞、钱德勒及新卡莱尔。

The Gaspésie (official name), or Gaspé Peninsula, the Gaspé or Gaspesia, is a peninsula along the south shore of the Saint Lawrence River to the east of the Matapédia Valley in Quebec, Canada, that extends into the Gulf of Saint Lawrence. It is separated from New Brunswick on its southern side by the Baie des Chaleurs (Chaleur Bay) and the Restigouche River.