Reedsburg is a city in Sauk County, Wisconsin, United States. Its population in 2020 was 9,984. The city is located 55 miles (89 km) northwest of Madison within the Baraboo micropolitan area. The city is surrounded by the Town of Reedsburg and is situated along the Baraboo River. It is the second-largest city in Sauk County after Baraboo, with a population of 9,984 at the time of the 2020 United States census.

Prior to the arrival of non-indigenous people in the 19th century, the region was home to the Ho-Chunk people. Reedsburg was first settled by James W. Babb in 1845. David C. Reed arrived in 1847, building a dam and being the namesake of the town. After the town was platted in 1852, growth would continue through its incorporation as a city in 1887. Historically, the area has relied on agriculture and manufacturing industries.

Reedsburg would grow significantly following World War II and again from 1990–2010.

Early settlers came to this area due to the abundance of natural resources, especially lumber. In 1844, the first copper mine was established in this area, but it was soon abandoned. James W. Babb and his wife Rebecca Scarff Babb are the earliest recorded settlers, having brought their family to Wisconsin from Ohio in 1845. At a place 55 miles northeast of Mineral Point (the capital of Wisconsin Territory), long identified by the Winnebago who inhabited these lands as a convenient place to cross the Baraboo River, Babb left a flat-bottomed boat to help move supplies.

At "Babb's Ford," in 1847 David C. Reed built a dam and a shanty to house the workers who constructed it. In June 1848 a sawmill followed. By 1850, "Shanty Row" comprised five tamarack shanties. These initial buildings were of poor construction, and did not have a strong foundation, due to the black-alder swamp by the Baraboo River. Main Street would later be built where "Shanty Row" stood.

Reedsburg was platted in 1852, and four years later the community had grown to 50 buildings housing 27 families and 122 people. The first bridge across the Baraboo River was built in 1853, located where the Main Street bridge would later be built. In 1854 the Mackey brothers purchased Reed's saw mill, and brought economic security to the area. As the town was growing, more farms continued to be developed around the area, cultivating a variety of crops.

The community continued under town government until 1868, when Reedsburg was incorporated as a village; it became a city in May 1887. In the 1860s, a hop boom temporarily brought wealth into the area. After the crash of the hops market, more farms started to diversify, and Reedsburg would become known for its grain and dairy products. The Chicago & North Western Railway (C&NW) arrived in 1872.

In the 1870s, Main Street started to develop, with grocery stores, banks, and other businesses establishing in Reedsburg. In 1880, the Reedsburg Brewing Company was formed. As the city continued to grow, more industries came to Reedsburg. On December 1, 1883, the Webb and Schweke department store opened, known as the "Big Store". The store would go on to be the largest department store in Sauk County. The City Hotel opened in 1886, owned by William Roper. Among the most important was the Reedsburg Woolen Mill. Construction was completed in 1882, and by 1899, 32 broad looms produced mainly "fancy cassimeres" for Chicago markets.