Fernando Alfonso Yznaga del Valle (October 16, 1850 – March 6, 1901) was a Cuban American banker who was one of the best-known men of New York and foreign society and club life. Described as "one of the most entertaining of men, very clever at epigram and repartee, and famous for quaint sayings. His life had been adventurous and, from a domestic point of view, somewhat of a stormy nature."