The Berkeley Open Infrastructure for Network Computing (BOINC) is a non-commercial middleware system for volunteer computing, originally developed to support the SETI@home project, but intended to be useful for other applications in areas as diverse as mathematics, medicine, molecular biology, climatology, and astrophysics. The intent of BOINC is to make it possible for researchers to tap into the enormous processing power of personal computers around the world.

BOINC has been developed by a team based at the Space Sciences Laboratory at the University of California, Berkeley led by David Anderson, who also leads SETI@home. As a "quasi-supercomputing" platform, BOINC has over 430,000 active computers (hosts) worldwide processing on average 663 TFLOPS as of September 8, 2007. BOINC is funded by the National Science Foundation through awards SCI/0221529, SCI/0438443, and SCI/0506411.

The software is free/open source software, released under the GNU Lesser General Public License. It is also used for commercial usages, as there are some private companies that are beginning to use the platform to assist in their own research. The framework is supported by various operating systems: Windows (XP/2K/2003/NT/98/ME), Unix (Linux, FreeBSD) and Mac OS X.