Yiannakis Theophani "John" Christodoulou (born 24 May 1965) is a Monaco-based British billionaire property developer, the owner of Yianis Group, a privately held company with a portfolio of residential, hotel, retail and leisure properties in the UK and Europe. His Yianis Group employs over 7,000 people in the UK alone. As of May 2021, Christodoulou's estimated net worth is £2.35 billion. Through Yianis Group, Christodoulou is reportedly one of England's biggest freeholder landlords.