Sir Robert Munro, 3rd Baronet of Foulis, (died 1668), 21st Baron and 24th chief of the Clan Munro was a 17th-century Scottish soldier and politician.
Robert succeeded to the head of his house upon the death of his cousin, Sir Hector Munro, 2nd Baronet of Foulis, who died at just 17 years of age in 1651. As the eldest son of Col. John Munro, 2nd of Obsdale, Robert was the head of the Munros of Obsdale family but was also a direct descendant and great grandson of Robert Mor Munro, 15th Baron of Foulis (died 1588).
As a young man Robert entered the army in 1626 and became an officer in Donald Mackay's regiment, serving first in Danish service and later in Swedish service where he highly distinguished himself during the Thirty Years' War on the continent, particularly during the Battle of Lutzen in 1632. According to 19th-century historian Alexander Mackenzie there were three Generals, eight Colonels, five Lieutenant-Colonels, eleven Majors and above thirty Captains, besides a large number of other soldiers all of the name Munro in the Swedish army during the Thirty Years' War. However, although there were numerous colonels and lower ranks bearing the name of Monro or Munro during the Thirty Years' War, none actually held the rank of general in any of the continental armies between 1618 and 1648. It was most likely this man recorded as a major in the regiment of Colonel Robert Monro in 1639 (it had reformed in 1637), just prior to the regiment's return to Scotland.
On 26 August 1643, during the minority of the former chief, "the Estates of the Kingdom passed an Act for the Committees of War in the shires of Scotland", and among the Commissioners for the Sheriffdom of Sutherland and a par of Inverness-shire, occurs the name of "Sir Robert Munro, tutour of Foulles"; and again on 24 July 1644, in a commission for a similar purpose and for the same Sheriffdom is found the name of "Sir Robert Monro, Tutor of Foullis".
In 1649, the Scottish Parliament separated from the Sherriffdom of Inverness-shire the "lands eastward of Altnalait, Knockravock and the Royal Burgh of Tain", erected the Sherriffdom of Ross, and appointed the Marquiss of Argyll the Sherriff-Principal. Afterwards the commission was granted to Sir Robert Munro, who had been elected Member of Parliament for Inverness-shire in 1649 and for his own County of Ross after it was separated from the County of Inverness, 1649–50, to be Sheriff-Principal of the County of Ross.