Henry Brittan Willis was an English landscape and animal painter.

Willis was born in Bristol and worked initially with his father, G. H. Willis, also a landscape painter. In 1842, after little financial success in his native city, and on the advice of his father, he traveled to New York, USA, to take up a job in a merchant's office. Owing to ill-health, he eventually had to relinquish the post and return to England, where he initially practiced as a portrait painter in Bristol.

In 1843 Willis settled in London where he gained a considerable reputation as a painter of landscapes and animals. From 1844 to 1862, he exhibited frequently at the galleries of the Royal Academy, British Institution (in Pall Mall) and Society of British Artists (in Suffolk street). He also showed his work outside London at places like the Liverpool Academy of Arts etc. From 1851-57 he was a member of the "Free Exhibitions" society. In 1862 he was elected an associate of the "Old" Watercolour Society (RWS), becoming a full member in 1863; He was a frequent contributor to the society's exhibitions.

Willis painted rural landscapes all over England, Wales and Scotland, in both oils and watercolour, and often featuring groups of farm animals such as cattle or sheep. He sometimes worked in collaboration with other artist such as F W Hulme. Four of his pictures were engraved for the "Art Union (AUL) Annual" of 1847. In 1849, he published "Studies of cattle and rustic figures" (London: George Rowney and Co.).

On 13 January 1873, 30 years of Willis's art work (including "studies from nature and some paintings" was destroyed in a fire at the "London Pantechnicon" in Motcombe street, Belgravia.

Willis died at his home at 12 Palace Gardens Terrace, Kensington, London, in January 1884, and was buried at Kensington cemetery at Hanwell, Middlesex (now in West London).

Willis was eclipsed by Constable, both in his lifetime and after it, but he has in recent years enjoyed a revival in interest.