Sandra Betty Blow (14 September 1925 – 22 August 2006) was an English abstract painter. Born in London, she suffered scarlet fever as a child, spending weekends and holidays at her grandparents' fruit farm. There she spent time painting, before enrolling at Saint Martin's School of Art in 1941. In 1947, she travelled to Italy to study art, enrolling in Accademia di Belle Arti, where she met Alberto Burri, her partner for a few years.
Blow and Burri travelled Italy before working together in Paris, and Burri was a significant influence on Blow, teaching her to work in different materials and inspiring a passion for art.