The Diary Of A CEO (DOAC) is the YouTube and podcast brand of British entrepreneur and Dragons' Den investor Steven Bartlett. Its format is long-form interviews with founders, athletes, scientists, health experts and, occasionally, crypto and finance personalities such as Raoul Pal. It is one of the largest interview shows in the world: since launching in 2019 the YouTube channel has grown past 18 million subscribers, 800-plus episodes and 1.5 billion total views, with a further 5 million followers on Steven's personal Instagram.

Beyond the show, Bartlett is a serial entrepreneur and investor. He founded the marketing group Flight Story and the venture fund Flight Fund, co-founded the Web3 development platform thirdweb, and has invested in more than 100 companies; his creator-media company Steven.com reached a reported valuation of around $425 million, billed as an attempt to build "the Disney of the creator economy." DOAC operates as a media business rather than a trading personality, which makes it most relevant as a platform and interviewer rather than a competitive-trading profile.