The Utah Data Center (UDC), also known as the Intelligence Community Comprehensive National Cybersecurity Initiative Data Center, is a data storage facility for the United States Intelligence Community that is designed to store data estimated to be on the order of exabytes or larger. Its purpose is to support the Comprehensive National Cybersecurity Initiative (CNCI), though its precise mission is classified. The National Security Agency (NSA) leads operations at the facility as the executive agent for the Director of National Intelligence. It is located at Camp Williams near Bluffdale, Utah, between Utah Lake and Great Salt Lake and was completed in May 2014 at a cost of $1.5 billion.

Critics believe that the data center has the capability to process "all forms of communication, including the complete contents of private emails, cell phone calls, and Internet searches, as well as all types of personal data trails—parking receipts, travel itineraries, bookstore purchases, and other digital 'pocket litter'." In response to claims that the data center would be used to illegally monitor email of U.S. citizens, in April 2013 an NSA spokesperson said, "Many unfounded allegations have been made about the planned activities of the Utah Data Center, ... one of the biggest misconceptions about NSA is that we are unlawfully listening in on, or reading emails of, U.S. citizens. This is simply not the case."

In April 2009, officials at the United States Department of Justice acknowledged that the NSA had engaged in large-scale overcollection of domestic communications in excess of the United States Foreign Intelligence Surveillance Court's authority, but claimed that the acts were unintentional and had since been rectified.

In August 2012, The New York Times published short documentaries by independent filmmakers titled The Program, based on interviews with former NSA technical director and whistleblower William Binney. The project had been designed for foreign signals intelligence (SIGINT) collection, but Binney alleged that after the September 11 terrorist attacks, controls that limited unintentional collection of data pertaining to U.S. citizens were removed, prompting concerns by him and others that the actions were illegal and unconstitutional. Binney alleged that the Bluffdale facility was designed to store a broad range of domestic communications for data mining without warrants.

Documents leaked to the media in June 2013 described PRISM, a national security computer and network surveillance program operated by the NSA, as enabling in-depth surveillance on live Internet communications and stored information. Reports linked the data center to the NSA's controversial expansion of activities, which store extremely large amounts of data. Privacy and civil liberties advocates raised concerns about the unique capabilities that such a facility would give to intelligence agencies. "They park stuff in storage in the hopes that they will eventually have time to get to it," said James Lewis, a cyberexpert at the Center for Strategic and International Studies, "or that they'll find something that they need to go back and look for in the masses of data." But, he added, "most of it sits and is never looked at by anyone."

The UDC was expected to store Internet data, as well as telephone records from the controversial NSA telephone call database, MAINWAY, when it opened in 2013.

In light of the controversy over the NSA's involvement in the practice of mass surveillance in the United States, and prompted by the 2013 mass surveillance disclosures by ex-NSA contractor Edward Snowden, the Utah Data Center was hailed by The Wall Street Journal as a "symbol of the spy agency's surveillance prowess".

Binney has said that the facility was built to store recordings and other content of communications, not only for metadata.