Mabel Scott Lauder Pryde (12 February 1871, Edinburgh, Scotland – July 1918, London, England) was an artist, and wife of artist William Nicholson and mother of artists Ben Nicholson and Nancy Nicholson and the architect Christopher 'Kit' Nicholson.
Mabel was the daughter of David Pryde, Headmaster of Edinburgh Ladies College 1870–1891, and Barbara Lauder, whose father William was a brother of the famous Scottish artists Robert Scott Lauder and James Eckford Lauder. Mabel had one brother, the artist James Pryde. As children they lived at 10 Fettes Row, a north-facing Edinburgh house.
Pryde trained at the Bushey School of Art under the tutelage of Hubert von Herkomer. Here she met fellow student William Nicholson, whom she married in 1893. She introduced Nicholson to her brother James and all three moved to Eight Bells, Denham, Buckinghamshire.
Pryde and Nicholson had four children: Ben (1894–1982); Anthony (1897–1918), killed in action during the First World War; Annie Mary "Nancy" (1899–1978); and Christopher "Kit" (1904–1948). They moved to Rottingdean in 1909. In July 1918 Pryde died from influenza during the 1918 flu pandemic.