Alcatel–Lucent S.A. (French pronunciation: [alkatɛl lysɛnt]) was a multinational telecommunications equipment company, headquartered in Boulogne-Billancourt, France. It was formed in 2006 by the merger of France-based Alcatel SA and U.S.-based Lucent Technologies, the latter being a successor of AT&T‘s Western Electric and a holding company of Bell Labs.

In 2014, the Alcatel-Lucent group split into two: Alcatel-Lucent Enterprise, providing enterprise communication services, and Alcatel-Lucent, selling to communications operators. The enterprise business was sold to China Huaxin Post and Telecom Technologies in the same year, and in 2016 Nokia acquired the remainder of Alcatel-Lucent.

The company focused on fixed, mobile and converged networking hardware, IP technologies, software and services, with operations in more than 130 countries. In 2014, it had been named Industry Group Leader for Technology Hardware & Equipment sector in Dow Jones Sustainability Indices review, and listed in the 2014 Thomson Reuters Top 100 Global Innovators for the 4th consecutive year. Alcatel-Lucent also owned Bell Laboratories, one of the largest research and development facilities in the communications industry, whose employees have been awarded nine Nobel Prizes and which holds in excess of 29,000 patents.