Phyllis Isobella Pearsall MBE was a British painter and writer who founded the Geographers' A-Z Map Company, for which she is regarded as one of the most successful business people of the twentieth century. She has erroneously been credited with creating London's first popular indexed street map.

The A–Z of Mrs P is a musical conceived by Neil Marcus and written by British playwright Diane Samuels and British composer Gwyneth Herbert. Described as "a musical fable inspired by the autobiographies of Phyllis Pearsall", it tells the story of Phyllis Pearsall's creation of the London A to Z street atlas. The A–Z of Mrs P was performed in workshop with actress Sophie Thompson in May 2011. It opened in London at Southwark Playhouse on 21 February 2014, starring Peep Show actress Isy Suttie and Frances Ruffelle.