William Constable Adam (29 August 1846 – 17 October 1931) was an English-born oil and watercolour painter of Scottish ancestry who spent the last 33 years of his life in California, United States.

"[2] At the age of 19 he traveled to South America, studied art in Buenos Aires, worked as a broker in Montevideo, and in 1926 published a serialized travelogue of his adventures.

[1][8] After changing addresses twice he occupied in 1906 the Pacific Grove home at 450 Central Avenue with his new wife, Mary Susan Taft, who was a Maine-born widow and 18 years younger than her husband.

Especially popular with tourists were his (often repeated) renderings of the local Spanish architecture, lush gardens and charming scenes along the Pacific Coast.

For competitive exhibitions he executed highly original landscapes which employed the bold dramatic brushwork of the French Impressionists.