Portable Computer Cards (PC cards) are interchangeable peripherals designed to be inserted into laptop computers in order to enable extra hardware functions. Such cards include (but are not limited to) flash memory, modems, network interface cards, and SCSI disk controllers.

They were first called PCMCIA cards as the original standards were set by the Personal Computer Memory Card International Association. This awkward initialism was jokingly expanded as "People Can't Memorize Computer Industry Acronyms" or "Personal Computer Manufacturers Can't Invent Acronyms". A later revision of the PC card is known as CardBus. The PCMCIA has developed a new notebook peripheral specification called ExpressCard.

The first PC cards (PCMCIA, with the more logical IBM meaning: Peripheral Component Microchannel Interconnect Architecture) were Type I, and supported actual Memory Cards (e.g. Linear or ATA Type I Flash Memory Cards), such as SRAM or flash memories. Type II cards added I/O support in addition to memory applications, and type III expanded functionality. The interface's role as I/O for various devices has largely superseded its role as a Memory Card, but this role did spawn a generation of flash memory cards that set out to improve on the size and features of ATA Type I cards (CompactFlash, MiniCard and SmartMedia).

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