Mary Sansom was an English operatic soprano best known for her performances in principal soprano roles with the D'Oyly Carte Opera Company in the 1950s and 1960s, including as Yum-Yum in The Mikado, Josephine in H.M.S. Pinafore, Phyllis in Iolanthe, the title role in Patience and Gianetta in The Gondoliers. In later years, she performed with Gilbert and Sullivan for All, directed stage productions and established a costume hire business. She also appeared in supporting roles on British television.

The D'Oyly Carte Opera Company is a professional British light opera company that, from the 1870s until 1982, staged Gilbert and Sullivan's Savoy operas nearly year-round in the UK and sometimes toured in Europe, North America and elsewhere. The company was revived for short seasons and tours from 1988 to 2003, and since 2013 it has co-produced four of the operas with Scottish Opera.