William Day snr (1797–1845) was a lithographer and watercolour artist in partnership with Louis Haghe, forming the lithographic firm of Day & Haghe, famous in early Victorian London. The firm printed lithographs dealing with an enormous variety of topics, including hunting scenes, topographical views and genre images. Their work was so technically superior that in 1838, they were appointed 'Lithographers to the Queen.' Two of the lithographers employed by Day and Haghe were Andrew Picken and Thomas Ashburton Picken.