Mary Fox may refer to

• Mary Fox, Baroness Holland (1746–1778), English noblewomen
• Lady Mary Fox (1798–1864), English writer, an illegitimate daughter of King William IV of the United Kingdom
• Mary Fox (artist) (1922–2005), English artist
• Mary Frank Fox, American academic
• Marye Anne Fox (1947–2021), American chemist and educator

• Marie Fox (1850–1878), also known as Mary, French writer and a princess of Liechtenstein
• Mary Fox-Strangways, Countess of Ilchester 1852–1935, English noblewoman