Clelia Haji-Ioannou is a Cypriot-British billionaire, investor, and heiress whose fortune is derived from two major sources: her inherited capital from her father, shipping magnate Loucas Haji-Ioannou, and her significant stake in the airline easyJet, founded by her brother, Stelios Haji-Ioannou. Born in Athens, Greece, in 1970, her background is steeped in the high-stakes world of Greek and Cypriot shipping.

She received a specialized education in finance, studying Banking and International Finance at City, University of London. She also pursued courses in Art History and Psychology, reflecting her diverse personal interests. Clelia entered her father's business early on, handling shipping and banking matters, gaining crucial financial acumen that allowed her to effectively manage her complex, diversified inheritance after the family's massive successful ventures.

Clelia Haji-Ioannou's career is defined by her role as a major shareholder in the low-cost airline easyJet (LSE: EZJ) and her strategic focus on private investment. Her wealth is secured by her portion of the capital generated by her father's shipping empire, which was then invested into easyJet when her brother launched the airline in the mid-1990s.

She served on the board of directors of the European Laiki Bank (1992–2000). Today, her primary focus is as an investor and board member of the Cyprus Marine Environment Protection Association (CYMEPA). Her personal fortune is often deployed into tangible assets, as she is reported to own $200 million in real estate assets across London, Monaco, and Greece. She also manages the Loucas Haji-Ioannou Foundation (endowed by her father), which provides scholarships and grants for medical research, solidifying her commitment to philanthropy.

Clelia Haji-Ioannou's social impact is centered on education and environmental protection, reflecting her family's long history in shipping. The Loucas Haji-Ioannou Foundation provides essential financial aid for students and medical grants for heart disease research.

Her role on the board of CYMEPA is a structural contribution to protecting the marine environment, aligning her family's legacy with modern sustainability efforts. She is also noted for her cultural contributions, spending time enriching the Clelia Haji-Ioannou Art Gallery that she founded and houses in a historic tower she owns in Greece.

Clelia Haji-Ioannou maintains the polished, sophisticated style of a European investor and heiress. Her attire is consistently formal and high-quality, favoring designer wear that reflects her residences in Monaco and London. Her aesthetic is one of confident, unostentatious wealth.

Residing in Monaco, her luxury is the security of multi-billion dollar wealth rooted in the essential air travel and shipping sectors. Her life is dedicated to the private management of her diversified assets and her commitment to cultural and philanthropic patronage.