Mary Slessor of Calabar: Pioneer Missionary is a biography by William Pringle Livingstone. It depicts the missionary work of Mary Slessor who took the Gospel to the West Coast of Africa.

Mary Mitchell Slessor (December 2, 1848 - January 13, 1915) born in Scotland, was a United Presbyterian Church missionary to Nigeria. Once in Nigeria, Slessor began teaching and learned Efik, the local language. Because of her understanding of the native language and her bold personality Slessor gained the trust and acceptance of the locals and was able to spread Christianity while promoting women's rights and protecting native children. She is most famous for having stopped the common practice of infanticide of twins among the Ibibio people, an ethnic group in southeastern Nigeria.

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This is the story of Mary Slessor, a petite redhead from the slums of Dundee who became one of the most influencing people in the land known to her compatriots as 'the white man's grave'. Despite her eccentricities, this woman truly understood and connected with the Africans among whom she lived, so much so that the British government appointed her their first woman magistrate anywhere in the world and later awarded her the highest honor then bestowed on a woman commoner. Examining both the eraand the influence of this extraordinary woman, the book reveals aspects of her public and private life that has previously been unanswered.