Arabella Duval Huntington (née Yarrington; c. 1850/1851 – September 16, 1924) was an American philanthropist and once known as the richest woman in the country. She was the force behind the art collection that is housed at the Huntington Library in California. She was the second wife of Collis P. Huntington, an American railway tycoon and industrialist. After his death, she married his nephew, Henry E. Huntington, also a railway magnate, and founder of the Huntington Library, Art Museum and Botanical Gardens, in San Marino, California.