Robert McMillan may refer to:

  • Robert S. McMillan (architect) (1916–2001), architect and co-founder of The Architects Collaborative
  • Robert S. McMillan (astronomer) (born 1950), astronomer at the University of Arizona
  • Robert McMillan (Australian judge) (1858–1931), Chief Justice of the Supreme Court of Western Australia
  • Robert Johnston McMillan (1885–1941), U.S. federal judge
  • Robert McMillan (farmer) (1887–1962), member of the New Zealand Legislative Council
  • Robert McMillan (footballer) (1857–1928), Welsh footballer
  • Robert MacMillan (1865–1936), Scottish national rugby union player
  • Bob MacMillan (born 1952), Canadian hockey player and politician

See also

  • Robbie Coltrane (actually Anthony Robert McMillan, 1950–2022), Scottish actor
  • McMillan (surname)