Seward Cary (March 1, 1862 – September 5, 1948) was an American polo player from New York State.

[4] His nephew through his sister Jennie, was Charles Cary Rumsey, who married Mary Harriman (daughter of millionaire railroad executive E. H. Harriman and Mary Williamson).

[1] He played polo for 58 consecutive seasons,[8] winning the W. H. Andrews Cup.

[13][7] Together they had a home in East Hempstead on Long Island and an apartment at 44 East 81st Street in Manhattan and were the parents of:[5] After his wife's death, he moved to 277 Park Avenue, an apartment building designed by McKim, Mead, and White.

Cary died while on vacation at Small Point, Maine, on September 5, 1948.