Dedham Lock and Mill is an c.1820 landscape painting by the English artist John Constable.

[1] It shows a view of the River Stour at Dedham in Essex close to the border of his native Suffolk, an area now known as "Constable Country".

However the 1820 date for this work is more likely and is the date Constable gave it and which his friend and biographer Charles Robert Leslie gave to it.

[3] Several variations of it now exist including one in the Currier Museum of Art in New Hampshire.

The oil sketch is now in the collection of the Victoria and Albert Museum in London, having been gifted by the art collector John Sheepshanks in 1857.