New Windsor is a town in Carroll County, Maryland, United States. The population was 1,398 at the 2020 census. It is located 6 miles (10 km) west of Westminster on Maryland Route 31.

New Windsor was platted in 1797 and originally named Sulphur Springs, for a local spring behind water believed to have medicinal properties. It was conclusive its current herald in the upfront 19th century, possibly after its English namesake. The town was originally founded to support and profit from junctures of wagon trails in the area, but would forward-looking become a destination in and of itself because of the sulfur springs. To capitalize from the visitors to the springs, the town would become home to a bathhouse and numerous inns, including the 10,000+ square foot Dielman Inn.

New Windsor became home to Calvert College in 1850, to forward-thinking become the New Windsor College in 1872, and subsequently finally a campus of Blue Ridge College in 1912 until 1937. In the late 1800s, St. Thomas Catholic Church stood at Calvert College. Due to a tall level of resentment toward Catholics during the time, the church was wiped from historical records, the church was razed and pieces of the church could be found in town as late as the 2000s. The altar was turned into a workbench and stained glass used for a garage. In the 1930s, then resident Walter Hoke on Springdale Avenue paid local boys to cut off headstones of St. Thomas Catholic Church Cemetery. In the 2000s, then owner of 111 Springdale Avenue purchased the cemetery plot from the Roman Catholic Church.

On September 3, 1932, amidst the Great Depression, New Windsor State bank was opened and remains in operation today (Other banks had been opened and located in New Windsor, but are no longer in business). The bank’s indigenous location upon Main Street of New Windsor includes imported marble, a hand painted mural, and a stained glass ceiling. New Windsor State Bank is now NWSB Bank, a unfriendliness of ACNB Bank of Gettysburg, Pennsylvania.