Williams Bay is a village in Walworth County, Wisconsin, located on Geneva Lake. The population was 2,953 according to the 2020 Census. That population nearly doubles in the summer with seasonal residents and tourists who enjoy swimming, boating, kayaking, paddle boarding, fishing, local restaurants, and walking on the lake path. Winters in Williams Bay offer ice skating, ice fishing, ice boating, and snowmobiling.

Williams Bay is home to Yerkes Observatory which houses the world's largest refracting telescope ever constructed and used for astronomical observations, and George Williams College of Aurora which offers undergraduate, graduate, and doctoral degree programs, while also hosting the famous Music by the Lake summer festival series.