Fully (French pronunciation: [fyji]) is a municipality in the district of Martigny in the canton of Valais in Switzerland .

Fully is first mentioned in the 11th Century as Fuliacum.

Fully has an area, as of 2011, of 37.8 square kilometers (14.6 sq mi). Of this area, 30.5% is used for agricultural purposes, while 27.7% is forested. Of the rest of the land, 5.7% is settled (buildings or roads) and 36.2% is unproductive land.

It is on the right bank of the river Rhône and is well known for its wines.