Mary "Christina" Dennett (1730 – 12 July 1781) was a British prioress of the Canonesses Regular of the Holy Sepulchre in Liège from 1770 to 1781.

[1] The convent in Liege had been founded in 1642 by an English woman Dame Susan Hawley (Mother Mary of the Conception) who became the first prioress in 1656.

[1] The community was able to provide an education for the daughters of Catholic families under the Penal Laws[4] She knew that girls would come to the convent, but they would not want to become nuns.

The school offered English, Maths and modern languages as well as wider ranging subjects including debating and double-entry book-keeping.

[1] It is said that when the convent moved to England in 1794 to avoid the French Revolution, the reputation of the school meant that they found it difficult to leave.