Marios Kyriazis (Greek: Μάριος Κυριαζής) (born 11 March 1956) is a medical doctor and gerontologist. He is known for work, publications and involvement with life extension. Applying the concept of hormesis on anti-ageing medicine, Kyriazis controversially suggested that leading a stressful, irregular and constantly stimulating lifestyle may be a way of reducing the impact of age-related dysfunction.