Rosa Winifred Nicholson (née Roberts; 21 December 1893 – 5 March 1981) was a British painter. She was married to the painter Ben Nicholson, and was thus the daughter-in-law of the painter William Nicholson and his wife, the painter Mabel Pryde. She was the mother of the painter Kate Nicholson.
Winifred Nicholson was a colourist who developed a personal impressionistic style, concentrating on domestic still life objects and landscapes. She often combined the two subjects as seen in her painting From Bedroom Window, Bankshead showing a landscape viewed through a window, with flowers in a vase in the foreground.