San Nicolas, officially the Municipality of San Nicolas (Tagalog: Bayan ng San Nicolas), is a 5th class municipality in the province of Batangas, Philippines. According to the 2020 census, it has a population of 23,908 people. It is equivalent to 0.15% of the population in the Calabarzon area or 0.82% of the total population of Batangas province. These numbers are used to calculate the population density, which is 1057 PD/km2. The municipality makes up 0.73% of Batangas's total area, with a land area of 22.61 sqkm.