Cronay is a municipality in the district of Jura-Nord Vaudois of the canton of Vaud in Switzerland.
Cronay is first mentioned in 1142 as Crosnai.
Cronay has an area, , of . Of this area, or 61.0% is used for agricultural purposes, while or 32.6% is forested. Of the rest of the land, or 5.8% is settled (buildings or roads), or 0.5% is either rivers or lakes and or 0.2% is unproductive land.
Of the built up area, housing and buildings made up 2.3% and transportation infrastructure made up 3.0%. Out of the forested land, 31.6% of the total land area is heavily forested and 1.1% is covered with orchards or small clusters of trees. Of the agricultural land, 53.4% is used for growing crops and 6.2% is pastures, while 1.4% is used for orchards or vine crops. All the water in the municipality is flowing water.
The municipality was part of the Yverdon District until it was dissolved on 31 August 2006, and Cronay became part of the new district of Jura-Nord Vaudois.
It consists of the village of Cronay and the hamlets of La Baumaz, La Crausaz and Planchamps.
The municipalities of Cronay, Cuarny, Pomy, Ursins, Valeyres-sous-Ursins and Villars-Epeney are considering a merger on at a date in the future into the new municipality with an, , undetermined name.
The blazon of the municipal coat of arms is Argent, a Saltire engrailed Azure, four Torteaux.
Cronay has a population () of . , 6.8% of the population are resident foreign nationals. Over the last 10 years (1999–2009 ) the population has changed at a rate of -0.3%. It has changed at a rate of 1.9% due to migration and at a rate of -2.3% due to births and deaths.
Most of the population () speaks French (299 or 97.1%) as their first language, with German being second most common (4 or 1.3%) and Italian being third (2 or 0.6%).
The age distribution, , in Cronay is; 20 children or 6.5% of the population are between 0 and 9 years old and 41 teenagers or 13.4% are between 10 and 19. Of the adult population, 39 people or 12.7% of the population are between 20 and 29 years old.