Robert Ker may refer to:
Robert Ker, 1st Earl of Roxburghe (c. 1570–1650), Scottish nobleman Robert Ker of Kersland (1634–1680), Scottish Covenanter Robert Ker, 3rd Earl of Roxburghe (c. 1658–1682), Scottish nobleman Robert Ker, 4th Earl of Roxburghe (c. 1677–1696), Scottish nobleman Robert Ker, 2nd Duke of Roxburghe (c. 1709–1755), Scottish nobleman Robert Ker (auditor general) (1824–1879), auditor general of the Colony and then the Province of British Columbia
See also Robert Kerr (disambiguation) Robert Ker Porter