苏铁（学名：Cycas revoluta），也称铁树、凤尾蕉、凤尾松、避火树，属于苏铁科的一种植物。

常绿乔木，树干短而粗，大型坚硬的叶子集生在茎顶，羽状分裂，线形裂片有一中脉，边缘向下卷曲，叶子呈深绿色，坚硬，叶子基部有刺。雌雄异株，球花生于茎顶，雄花由无数鳞片状的雄蕊所成，雌花由一羽毛状的心皮所成，心皮下部两缘生胚珠数枚。红色核果状的种子，微扁。苏铁寿命可达200年以上。

Cycas revoluta (Sotetsu [Japanese ソテツ], sago palm, king sago, sago cycad, Japanese sago palm), is a species of gymnosperm in the family Cycadaceae, native to southern Japan including the Ryukyu Islands. It is one of several species used for the production of sago, as well as an ornamental plant.