古丝温（Gúthwinë）是托尔金（J. R. R. Tolkien）奇幻小说的虚构武器。在古英语里，“古丝温”的意思是“战友”。
古丝温是伊欧墨（Éomer）的宝剑。伊欧墨以古丝温参与圣盔谷之战（Battle of the Hornburg），推测也以此剑参与帕兰诺平原战役（Battle of the Pelennor Fields）及黑门之战（Battle of the Morannon）。
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