Ralph Darwin Miller (March 15, 1873 – May 7, 1973) was an American right-handed pitcher in Major League Baseball who played for the Brooklyn Bridegrooms and Baltimore Orioles during the 1898 and 1899 baseball seasons. Born in Cincinnati, he died there at age 100; he was the first major league player to live to his 100th birthday. At the time of his death he was believed to be the last surviving 19th century Major Leaguer, a title which he unofficially held until the 1990s when baseball researchers discovered that Charlie Emig, a pitcher who played in one game in 1896 and died in 1975, held that distinction.