James Edward O'Keefe III (born June 28, 1984) is an American political activist who founded Project Veritas, a far-right activist group that uses deceptively edited videos and information gathering techniques to attack mainstream media organizations and progressive groups. Both O'Keefe and Project Veritas have produced secretly recorded undercover audio and video encounters in academic, governmental, and social service organizations, purporting to show abusive or illegal behavior by representatives of those organizations; the recordings are often selectively edited to misrepresent the context of the conversations and the subjects' responses. O'Keefe served as chairman until he was fired from the organization in February 2023.

O'Keefe first gained national attention for his selectively edited video recordings of workers at Association of Community Organizations for Reform Now (ACORN) offices in 2009, his arrest and misdemeanor guilty plea in 2010 for entering the federal office of then-U.S. Senator Mary Landrieu (D-LA) under false pretenses, and the release of misleading videos of conversations with two high-ranking, now former, NPR executives in 2011.

When his videos – heavily edited to portray ACORN workers seemingly aiding a couple in criminal planning – were publicized, the U.S. Congress voted to freeze funds for the non-profit. The national controversy resulted in the non-profit also losing most of its private funding before investigations of the videos concluded no illegal activity occurred. In March 2010, ACORN was close to bankruptcy and had to close or rename most of its offices. Shortly thereafter, the California State Attorney General's Office and the US Government Accountability Office (GAO) released their related investigative reports. The Attorney General's Office found that O'Keefe had misrepresented the actions of ACORN workers in California and that the workers had not broken any laws. A preliminary probe by the GAO found that ACORN had managed its federal funds appropriately. One of the fired ACORN workers sued O'Keefe for invasion of privacy; O'Keefe issued an apology and agreed to pay $100,000 in a settlement.

O'Keefe has gained support from right-wing and conservative media and interest groups, as well as from the far right. In 2009, Andrew Breitbart commissioned him for the option to publish new videos exclusively on BigGovernment.

The Project Veritas board removed O'Keefe from leadership positions in February 2023 for what it said was financial malfeasance with donor money. On March 15, 2023, O'Keefe launched a new organization called O'Keefe Media Group. Project Veritas subsequently sued O'Keefe and two others, alleging that they had created the competing O'Keefe Media Group while still employees, approaching PV's donors and using company funds for this purpose. O'Keefe was also alleged to have improperly spent company funds on himself.