Liddes is a municipality in the district of Entremont in the canton of Valais in Switzerland.
Liddes is first mentioned in 1177 as Leides.
Liddes has an area, , of . Of this area, 33.4% is used for agricultural purposes, while 23.8% is forested. Of the rest of the land, 1.3% is settled (buildings or roads) and 41.5% is unproductive land.
It lies north of Bourg-Saint-Pierre and north-west of the Grand Combin.
The municipality is located on the road over the Great St Bernard Pass. It consists of a number of hamlets including Liddes-Ville, Chandonne, Fontaine, Rive-Haute, Drance, Fornex, Les Moulins, Vichères, Chez-Petit and Palasui.
The blazon of the municipal coat of arms is Gules, St. George armoured Azure haloed Or riding a Horse Argent killing the Dragon Vert.
Liddes has a population () of . , 6.7% of the population are resident foreign nationals. Over the last 10 years (1999–2009) the population has changed at a rate of 8.7%. It has changed at a rate of 10% due to migration and at a rate of 1.2% due to births and deaths.
Most of the population () speaks French (648 or 98.3%) as their first language, German is the second most common (5 or 0.8%) and Portuguese is the third (3 or 0.5%).
the gender distribution of the population was 50.9% male and 49.1% female. The population was made up of 357 Swiss men (47.4% of the population) and 26 (3.5%) non-Swiss men. There were 341 Swiss women (45.3%) and 29 (3.9%) non-Swiss women. Of the population in the municipality 447 or about 67.8% were born in Liddes and lived there in 2000. There were 99 or 15.0% who were born in the same canton, while 59 or 9.0% were born somewhere else in Switzerland, and 33 or 5.0% were born outside of Switzerland.
The age distribution of the population () is children and teenagers (0–19 years old) make up 26.9% of the population, while adults (20–64 years old) make up 53.9% and seniors (over 64 years old) make up 19.3%.
there were 279 people who were single and never married in the municipality. There were 318 married individuals, 47 widows or widowers and 15 individuals who are divorced.