Calauan is a second class municipality in the province of Laguna, Philippines. According to the 2010 census, it has a population of 74,890 people. The town got its name from the term kalawang, which means rust. Calauan is known for the Pineapple Festival, which is celebrated every May.
In 1993, the town became the focus of media attention when Antonio Sánchez, who was serving as mayor at the time, got involved into a double murder case involving two UPLB students. Sánchez and several other men were given a life sentence.
Calauan's population is expected rise as the town is being used as resettlement of informal settlers in Metro Manila through the Bayan ni Juan and the Kapit-Bisig Para sa Ilog Pasig project of the ABS-CBN Foundation.
The Hidden Valley Springs, a popular hot spring resort, although its entrance is situated in the adjacent town of Alaminos, is actually within Calauan's boundaries.