UIP may refer to:
- United International Pictures, a film distributor
- Usual interstitial pneumonia, a form of lung disease characterized by progressive scarring of both lungs
- uIP (micro IP), An embedded TCP/IP protocol stack intended for small 8-bit and 16-bit microcontrollers
The uIP is an open source implementation of the TCP/IP network protocol stack intended for use with tiny 8- and 16-bit microcontrollers. It was initially developed by Adam Dunkels of the "Networked Embedded Systems" group at the Swedish Institute of Computer Science, licensed under a BSD style license, and further developed by a wide group of developers.
uIP can be very useful in embedded systems because it requires very small amounts of code and RAM. It has been ported to several platforms, including DSP platforms.
In October 2008, Cisco, Atmel, and SICS announced a fully compliant IPv6 extension to uIP, called uIPv6.