Henri Joyeux (French pronunciation: [ɑ̃ʁi ʒwajø]; born 28 June 1945) is a French oncologic surgeon, nutrition specialist and writer.

Following graduation from the University of Montpellier, Joyeux became a surgeon in general oncology in 1972, and a professor in digestive surgery and oncology. He worked at the Curie Institute of Paris from 1992 to 1997 and became a member of the New York Academy of Sciences in 1992. He wrote a number of general-interest books about health and nutrition.

In the year 2000, he began making appearances on television and delivering talks. He was a member of the French Economic, Social and Environmental Council from 2010 to 2015. His skeptical views on vaccination and on non-traditional families have made him a controversial figure.

Joyeux was born in Montpellier, where he studied medicine. He graduated from the University of Montpellier in 1972 with a PhD thesis on artificial gut with total parenteral nutrition.

In 1973, Joyeux became surgeon at the Regional Cancer Institute of Montpellier. He was also appointed director of the Laboratory of Nutrition and Experimental Oncology at the Cancer Institute of Montpellier in 1972. In 1980, he became professor of oncology at the University of Montpellier, and then professor of general surgery in 1986.

Joyeux was awarded the Antoine Lacassagne award in 1986 for his research on artificial nutrition and its therapeutic use in digestive track cancers. He joined the Curie Institute of Paris as head of the Visceral and Digestive Surgery Department in 1992 and became a member of the New York Academy of Sciences on the same year. Two years later, in 1994, he became a member of the French National Academy of Surgery.

In 2008, he was made Chevalier (Knight) of the Legion of Honour for "41 years of service in civil, military and associative activities".

He retired in 2014.^{[citation needed]}