Mary Ann Kilner (née Maze; 1753–1831) was a prolific English writer of children's books in the late 18th century.

Mary Ann was born on 14 December 1753 at Spital (then Spittal) Square, London, the youngest child of James Maze (d. 1794), a prosperous Huguenot silk throwster and merchant.

On 18 September 1774 Mary Ann married Thomas and moved to her husband's home at 33 Spital Square.

[4] Following the appearance of her sister-in-law's The First Principles of Religion in 1780, Mary Ann approached Dorothy's publisher, John Marshall, with her own Familiar Dialogues for the Instruction and Amusement of Children of Four and Five years Old, which Marshall published the following year.

Their works were originally published anonymously, but after Dorothy adopted the initials M. P. (representing her home at Maryland Point), Mary Ann used S. S. (for Spital Square).