May Day used to be an annual celebration on the main campus. As part of the festivities, students would elect a queen and her court. In 1966, the student newspaper reported that the tradition was discontinued because of the cost, lack of interest, and the fact that the position served no real purpose. (“Exec Council Reconsiders Prom Queen”. The Web, vol. 43, no. 9, March 4, 1966, p. 3). May queens are listed below:
- 1926: Theresa Shea (called the 1st May Queen by the 1927 Lauretanum, the school's yearbook)
- 1927: Juanita Abell
- 1928: Gertrude Jolley
- 1929: Margaret Vollet
- 1930: Adelaide Murphy
- 1931: Dorothea Shuford
- 1932: Mary Dooling
- 1933: Mary McCarthy
- 1934: Dorothy Nelson
- 1935: Ann Heald
- 1936: Mary Frances Higgins
- 1937: Lenore O’Connor
- 1938: Rosemary Boehm
- 1939: Marjorie Belt
- 1940: Ruth Rummelhart
- 1941: Helen Thurmond
- 1942: Virginia Lee Daly
- 1943: Ellanora Valle
- 1944: Lucille Walde
- 1945: Jean Willard
- 1946: Trudy Bernard
- 1947: Jeanne Sheridan
- 1948: Joan Mazzoni
- 1949: Marianne Julius
- 1950: Mary Alice Franzman
- 1951: Dolly Witges
- 1952: Martha Cummings
- 1953: Fran Martin
- 1954: Margie Devereux
- 1955: Carm Chiapetta
- 1956: Judy Shelton
- 1957: Mary Key McDermott (photo of Mary Kay McDermott being crowned by Judy Shelton)
- 1958: Marcia Hale (photo of Marcia Hale being crowned by Mary Kay McDermott)
- 1959: Carol Natter (photo)
- 1960: Sandy Stephens (photo of Sandy Stephens being crowned by Carol Natter)
- 1961: Pat Chesley (photo of Pat Chesley being crowned by Sandy Stephens)
- 1962: Ellen Steffan (photo)
- 1963: Mary Lynn Metternich
- 1964: Ginger Broom
- 1965: Rosemary Bergin