Robert Caldwell (1814–1891) was a British missionary and linguist. Robert Caldwell may also refer to: Robert Caldwell (academic) (1843–1914), master of Corpus Christi College, Cambridge Robert Porter Caldwell (1821–1885), American representative from Tennessee Robert Caldwell (Australian politician) (1843–1909), South Australian politician Robert Caldwell (Wisconsin politician) (1866–1950), American farmer, businessman, and politician Robert Caldwell (footballer) (1909–?), English footballer Robert R. Caldwell, American theoretical physicist Robert Granville Caldwell (1882–1976), American historian, author, and diplomat Bobby Caldwell (1951–2023), American musician Bobby Caldwell (drummer) (born 1951), American drummer Dr. Robert Caldwell, a character on St. Elsewhere portrayed by Mark Harmon