JDS Uniphase Corporation (NASDAQ: JDSU) is a company that designs and manufactures products for optical communications networks, communications test and measurement equipment, lasers, optical solutions for authentication and decorative applications, and other custom optics. It is headquartered in Milpitas, California in the United States. It was formerly known as JDS Uniphase, prior to a rebranding of its corporate image on September 14, 2005. The legal entity is now called JDS Uniphase Corporation, whereas elsewhere the company always refers to itself as JDSU.

JDSU was formed by the 1999 merger between two fiber-optic companies, JDS Fitel of Canada and Uniphase Corporation in the U.S., and became known as JDS Uniphase subsequent to the merger. In 1981, JDS Optics was founded by Jozef Straus, Philip Garel-Jones, Gary Duck, and Bill Sinclair. The "JDS" is short for Jones, Duck and Straus/Sinclair. The company became JDS Fitel when it formed a partnership with Fitel, a fiber optic and optical connector company. Three other major fiber companies merged with JDS Uniphase during the telecom boom: Optical Coating Laboratory Inc. (OCLI) based in Santa Rosa, California, E-TEK Dynamics and SDL bought for 45 B$, both based in San Jose, California. With the changes in executive membership that came as a result of these mergers, JDS Uniphase moved its headquarters first to San Jose, California, and then in 2006 to nearby Milpitas.