Milwaukee Country Day School (MCD) was a country day school in Whitefish Bay, Wisconsin, United States. It operated under the headmastership of A. Gledden Santer. The school was begun in 1917, "incorporated by leading citizens.". According to alumnus Henry Reuss, "Country Day, with its Church of England prayers, its 'body sports' and its Latin studies, marked the general de-Germanization of Milwaukee culture which occurred in the 1920s."
In 1964 it merged with two other local day schools (Milwaukee University School and Milwaukee-Downer Seminary) to become the University School of Milwaukee. MCD's facilities became the South Campus, which operated until it closed in 1985. It is now the home of the Milwaukee Jewish Day School.
The school appears in the novel Shadowland by alumnus Peter Straub.