Rennaz is a municipality of the canton of Vaud in Switzerland, located in the district of Aigle.
Rennaz is first mentioned in 1252 as ad villam de rayna.
Rennaz has an area, as of 2009, of 2.19 square kilometers (0.85 sq mi). Of this area, 1.48 km2 (0.57 sq mi) or 67.6% is used for agricultural purposes, while 0.04 km2 (0.015 sq mi) or 1.8% is forested. Of the rest of the land, 0.68 km2 (0.26 sq mi) or 31.1% is settled (buildings or roads), 0.01 km2 (2.5 acres) or 0.5% is either rivers or lakes.
Of the built up area, industrial buildings made up 3.2% of the total area while housing and buildings made up 8.7% and transportation infrastructure made up 14.2%. Power and water infrastructure as well as other special developed areas made up 1.8% of the area while parks, green belts and sports fields made up 3.2%. Out of the forested land, all of the forested land area is covered with heavy forests. Of the agricultural land, 57.1% is used for growing crops and 6.8% is pastures, while 3.7% is used for orchards or vine crops. All the water in the municipality is flowing water.