苏厄德半岛（Seward Peninsula）位于美国阿拉斯加州西部，其西端威尔士王子角是北美洲的最西端。南为诺顿湾和白令海，西隔白令海峡与亚洲大陆相望，北为楚科奇海和科策布湾。长约330千米，宽145到225千米。该半岛得名于1867年代表美国与俄国谈判购得阿拉斯加领土的美国国务卿威廉·H·苏厄德。

The Seward Peninsula is a large peninsula on the western coast of the U.S. state of Alaska. It projects about 320 kilometers (200 mi) into the Bering Sea between Norton Sound, the Bering Strait, the Chukchi Sea, and Kotzebue Sound, just below the Arctic Circle. The entire peninsula is about 330 kilometers (210 mi) long and 145 km (90 mi)-225 km (140 mi) wide.