Option键是苹果标准键盘中的按键，一般位于Control键与Command键之间。现代的苹果台式机和笔记本的键盘上有两个Option键，分别位于空格键两侧。

苹果通常使用 ⌥（U+2325）来代表Option键。

从20世纪90年代开始，苹果电脑的Option键上也有“Alt”字样，但实现的功能与类Unix系统或Windows系统的Alt键不同。特别要注意它不是用来访问菜单或快捷键，而是用作其他命令代码的修饰键，也有助于访问附加符号。从这个角度说它类似IBM PC兼容机键盘上的AltGr键。

The Option key is a modifier key present on Apple keyboards. It is located between the Control key and Command key on a typical Mac keyboard. There are two option keys on modern Mac desktop and notebook keyboards, one on each side of the space bar.

Apple commonly uses the symbol U+2325⌥OPTION KEY to represent the Option key. From 1980 to 1984, on the Apple II family, this key was known as the closed apple key, and had a black line drawing of a filled-in apple on it. (See command key for information about the history and the "open apple".)