Louis Lliboutry (Spanish: Luis Lliboutry) (1922–2007) was an early French glaciologist, geographer and mountaineer.
In his early years he worked in South America, producing the first high quality maps of the Andes between 1951 and 1953. After his return to France he established the Laboratory of Glaciology at Grenoble in 1958 (which became the Laboratoire de Glaciologie et Géophysique de l’Environnement (LGGE) in 1970), a laboratory specializing in glacier studies and ice mechanics which he ran for 25 years.
One of his most famous works is the extensive treaty of Nieves y Glaciares de Chile: Fundamentos de Glaciología published in 1956. Lliboutry's works concentrated on the glaciology of the Dry Andes and Wet Andes, especially in the surroundings of Santiago. One of his most notable contributions was an explanation for the formation of penitentes.
He was president of the European Geophysical Society between 1976 and 1978 and was awarded the Seligman Crystal by the International Glaciological Society in 1993.
The mountain Cerro Lliboutry in the south of Chile and a glacier in Antarctica are both named in his honour.