Robert Antoine Müller (1821-1883) was a British painter who worked in the second half of the 19th century. Müller or Muller lived in London and worked between around 1870 and 1883. He made a name for himself as a portrait painter and painted between other royal doctors and other prominent figures, such as Benjamin Disraeli. He also excelled as a genre painter. He exhibited seven works at the Royal Academy and three works at The Royal Society of British Artists.
Several of his works belong to the Royal Art Collection in Great Britain