Williams Bay is a village in Walworth County, Wisconsin, United States.
Williams Bay is home to the Yerkes Observatory.
Williams Bay is one of three incorporated villages on Geneva Lake. Williams Bay is home to a beautiful lake-side park including a beach. The park also has a public boat launching facility. Williams Bay is named for Captain Israel Williams of Connecticut, a War of 1812 sea captain, who with several of his sons, settled in the area in 1835.
The public schools include Williams Bay Elementary and Williams Bay High School. There is one private school that services K-12, Faith Christian School.
George Williams College of Aurora University is also located along the lake.