Donie O'Sullivan (born 24 March 1991)[1] is a senior correspondent working for CNN in New York City.

[7] O'Sullivan has covered the impact of social media on politics and reported on the 2021 United States Capitol attack.

[7] When Mike Lindell held a three-day "Cyber Symposium" in August 2021, with a promise that he would present "irrefutable evidence" of election fraud, O'Sullivan attended and brought cybersecurity expert Harri Hursti to the conference; Hursti said that Lindell's purported evidence was a "pile of nothing" and found no proof of election fraud.

[10][11] In 2021, O'Sullivan's work on a story about a COVID-19 "patient-zero conspiracy theory" (broadcast by CNN in 2020) was nominated for a News & Documentary Emmy Award.

[18] During the 2024 US presidential campaign, O'Sullivan led reporting for three hour-long CNN specials titled "MisinfoNation," as part of The Whole Story With Anderson Cooper.