Incarnate Word Academy is a Roman Catholic, private, secondary school for women. The school is sponsored by the Congregation of the Sisters of Charity of the Incarnate Word. The school is located in Bel-Nor, a suburb of St. Louis, in the Roman Catholic Archdiocese of Saint Louis.

In 1932, the Sisters of Charity of the Incarnate Word opened the all-girls high school in response to a need for the education of young women. In the first year, the school enrolled thirty-five students. Three additional buildings and seventy-five years later, the school is now home to about five hundred students.

Cheerleading, soccer, volleyball, and basketball are sports in which the school has won state championships. The school also offers a variety of sports including softball, tennis, golf, cross country, track, dance, swimming, and lacrosse. The Red Knights' most recent state championship title was at the 2024 Missouri State High School Basketball Championship game against Springfield Kickapoo on March 16, 2024, in Columbia, Missouri. They won with a score of 53-43 bringing the school their seventh state championship title in a decade. IWA basketball also holds the longest game winning streak in the history of Missouri with 131 wins.

• Shandi Finnessey (1996), Miss USA winner
• Napheesa Collier (2015), WNBA All-Star forward

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