Marc Riboud (French: [ʁibu]; 24 June 1923 – 30 August 2016) was a French photographer, best known for his extensive reports on the Far East: The Three Banners of China, Face of North Vietnam, Visions of China, and In China.

Riboud was born in Saint-Genis-Laval and went to the lycée in Lyon. He photographed his first picture in 1937, using his father's Vest Pocket Kodak camera. As a young man during World War II, he was active in the French Resistance, from 1943 to 1945. After the war, he studied engineering at the École Centrale de Lyon from 1945 to 1948.

Until 1951 Riboud worked as an engineer in Lyon factories, but took a week-long picture-taking vacation, inspiring him to become a photographer. He moved to Paris where he met Henri Cartier-Bresson, Robert Capa, and David Seymour, the founders of Magnum Photos. By 1953 he was a member of the organization. His ability to capture fleeting moments in life through powerful compositions was already apparent, and this skill was to serve him well for decades to come.

Over the next several decades, Riboud traveled around the world. In 1957, he was one of the first European photographers to go to China, and in 1968, 1972, and 1976, Riboud made several reportages on North Vietnam. Later he traveled all over the world, but mostly in Asia, Africa, the U.S. and Japan. Riboud has been witness to the atrocities of war (photographing from both the Vietnam and the American sides of the Vietnam War), and the apparent degradation of a culture repressed from within (China during the years of chairman Mao Zedong's Cultural Revolution). In contrast, he has captured the graces of daily life, set in sun-drenched facets of the globe (Fès, Angkor, Acapulco, Niger, Bénarès, Shaanxi), and the lyricism of child's play in everyday Paris. In 1979 Riboud left the Magnum agency.

Riboud's photographs have appeared in numerous magazines, including Life, Géo, National Geographic, Paris Match, and Stern. He twice won the Overseas Press Club Award, received the Lifetime Achievement Award at the 2009 Sony World Photography Awards and has had major retrospective exhibitions at the Musée d'Art Moderne de la Ville de Paris and the International Center of Photography in New York.

Riboud was made an Honorary Fellow of the Royal Photographic Society in 1998.

One of Riboud's best known images is Eiffel Tower Painter, taken in Paris in 1953. It depicts a man painting the tower, posed like a dancer, perched between the metal armature of the tower. Below him, Paris emerges from the photographic haze. Lone figures appear frequently in Riboud's images. In Ankara, a central figure is silhouetted against an industrial background, whereas in France, a man lies in a field. The vertical composition emphasizes the landscape, the trees, sky, water and blowing grass, all of which surround but do not overpower the human element.

An image taken by Riboud on 21 October 1967, entitled "The Ultimate Confrontation: The Flower and the Bayonet," is among the most celebrated anti-war pictures. Shot in Washington, D.C. where thousands of anti-war activists had gathered in front of the Pentagon to protest against America's involvement in Vietnam, the picture shows a young girl, Jan Rose Kasmir, with a flower in her hands and a kindly gaze in her eyes, standing in front of several rifle-wielding soldiers stationed to block the protesters. Riboud said of the photo, "She was just talking, trying to catch the eye of the soldiers, maybe trying to have a dialogue with them. I had the feeling the soldiers were more afraid of her than she was of the bayonets."