Leytron is a municipality in the district of Martigny in the canton of Valais in Switzerland .

Leytron is first mentioned in 1219 as Leitrun.

Leytron has an area, as of 2009, of 26.9 square kilometers (10.4 sq mi). Of this area, 7.27 km2 (2.81 sq mi) or 27.1% is used for agricultural purposes, while 8.09 km2 (3.12 sq mi) or 30.1% is forested. Of the rest of the land, 1.68 km2 (0.65 sq mi) or 6.3% is settled (buildings or roads), 0.15 km2 (37 acres) or 0.6% is either rivers or lakes and 9.73 km2 (3.76 sq mi) or 36.2% is unproductive land.

Of the built up area, housing and buildings made up 3.6% and transportation infrastructure made up 1.9%.