Mr and Mrs William Hallett (or The Morning Walk) is a 1785 oil on canvas painting by the British painter Thomas Gainsborough, and is now in the collection of the National Gallery in London (NG 6209).

[1] Gainsborough painted the work in the summer of 1785, when the subjects, William Hallett (1764–1842) and Elizabeth Stephen (1763/4-1833) were both aged 21, shortly before their wedding at the church of St Lawrence in Little Stanmore on 30 July 1785.

Hallett was a gambler, lost money in business transactions, and worked his way through his fortune by 1830, although the marriage was reportedly a happy one.

The couple may be wearing their wedding clothes, with Elizabeth in a gown of billowing ivory silk with lace cuffs, gathered at the waist with black silk, with a green ribbon tied at the breast echoed by the large green bow tied around a wide-brimmed black hat topped by ostrich plumes.

The painting was acquired for the National Gallery in 1954, from the collection of Lord Rothschild, for £30,000, the Art Fund providing a grant of £5000 towards the purchase price.