Robert Thorpe (c. 1764 – May 11, 1836) was a judge and political figure in Upper Canada and was later chief justice of Sierra Leone.
He was born in Dublin, Ireland around 1764. He graduated with a degree in law from Trinity College, Dublin and was admitted to the bar in 1790.
In 1801, he became Chief Justice of Prince Edward Island. Because he was not getting paid on time, he sailed to England in 1804 but was captured by a French privateer. Thorpe later escaped and was named to Court of King's Bench in Upper Canada. On the death of his friend, William Weekes, in a duel, he was elected in a by-election to the 4th Parliament of Upper Canada representing Dundas, Simcoe & 1st York. (In that election, his supporters included at least twelve men who would later be accused of treason, one being Elijah Bentley). He advocated that the executive council should be responsible to the elected representatives. He was suspended from office by the lieutenant governor Francis Gore in July 1807.
In 1808, he was appointed the first chief justice in Sierra Leone (chief justice and judge of the Vice-Admiralty Court).
He preside over the cases of Samuel Samo (7-10 April 1812), Joseph Peters (11 June 1812) and William Tufft (12 June 1812).
He served until 1815, when he was dismissed from colonial service. In 1815 he published A Letter to William Wilberforce, Esq. M. P., Vice-President of the African Institution which was critical of the Sierra Leone Company and the African Institution which succeeded it.