Kleiner Perkins Caufield & Byers (KPCB) is a venture capital firm located on Sand Hill Road in Menlo Park in Silicon Valley. The Wall Street Journal and other media have called it one of the "largest and most established" venture capital firms and by Dealbook as "one of Silicon Valley’s top venture capital providers."

KPCB specializes in investments in incubation and early stage companies.Since its founding in 1972, Kleiner Perkins Caufield & Byers has backed entrepreneurs in more than 500 ventures including AOL, Amazon.com, Navigenics, Citrix, Compaq, Electronic Arts, Genentech, Genomic Health, Geron Corporation,Google, Intuit, Juniper Networks, Nebula,Netscape, Sun Microsystems, Symantec, Verisign, WebMD and Zynga. KPCB focuses its global investments in three practice areas – digital, green tech and life sciences.