The Sony CLIÉ (pronounced "KLEE-AY" Latin) was a series of personal digital assistants running the Palm Operating System developed and marketed by Sony from 2000 to 2005. The devices introduced many new features to the PDA market, such as a jog-wheel interface, high-resolution displays, and Sony technologies like Memory Stick slots and ATRAC3 audio playback. Most models were designed and manufactured in Japan.

The name is an acronym for creativity, lifestyle, innovation, emotion though formerly communication, link, information and entertainment. It was initially an attempt at a new coinage term, though it means "tool" in the Jèrriais language. The CLIÉ handhelds were distinguished from other Palm OS models by their emphasis on multimedia capabilities, including photo, video, and audio playback, long before any other Palm OS PDAs had such capabilities.

Later models have been credited with spurring competition in the previously stagnant Palm market, closing many of the gaps that existed between Palm OS PDAs and those powered by Microsoft's Windows Mobile operating system, particularly on the multimedia front, but also with Sony's proprietary application launcher interface. Officially, the CLIÉ line never supported the Macintosh OS, and Sony never provided any software with the handhelds for Mac OS. However, as a Palm OS device, every CLIÉ handheld was inherently capable of HotSync operations with a Mac OS computer.

This allowed for the synchronization of the basic PIM functions, as well as for the installation of new software, though this inherent capability was unusable because the Mac HotSync software would not recognize the handheld. PalmSource, however, silently added the capability to recognize older CLIÉ devices when providing new versions of its Palm Desktop software for Mac. This was necessary for those who could synchronize only via USB.

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