Mac OS X v10.4，开发代号“Tiger”（老虎），是苹果电脑公司开发的操作系统，于2005年4月29日正式上市销售。

Mac OS X v10.4 "Tiger"作为Mac OS X v10.3 "Panther"的继任者，相比前版操作系统有显着功能增强，据官方数据，它包括超过200项新的改进。

Mac OS X v10.4系统引入了Spotlight、Dashboard等新技术，Spotlight类似Microsoft Windows平台的Google Desktop Search，可以快速搜索计算机中的各种资源。Dashboard是一个易于使用的工具集，只需要按下F12快捷键，即可快速打开。

Mac OS X 10.4 Tiger is the fifth major release of Mac OS X, Apple's desktop and server operating system for Mac computers. Tiger was released to the public on April 29, 2005 for USD $129.95 as the successor to Mac OS X Panther. Some of the new features included a fast searching system called Spotlight, a new version of the Safari web browser, Dashboard, a new ‘Unified’ theme, and improved support for 64-bit addressing on Power Mac G5s. Tiger shocked executives at Microsoft by offering a number of features, such as fast file searching and improved graphics processing, that Microsoft had spent several years struggling to add to Windows with acceptable performance.