Sir Robert Sangster Rait CBE DL (10 February 1874 – 25 May 1936) was a Scottish historian, Historiographer Royal and Principal of the University of Glasgow.
He became a prominent figure in the intellectual and cultural life of the city, frequently contributing letters and articles to the Glasgow Herald, often anonymously.
In this role he sought continue the close relationship he had developed with students as a professor, relocating the Principal's office to the Main Building of the university, where it remains today, making his time more freely available to students and staff, and frequently entertaining guests at the Principal's Lodging.
After being knighted in 1933, he was met on his return from London to Glasgow Central station by hundreds of students and escorted to the university in a carriage drawn by Blues and led by the band of the OTC.
In September 1935, he developed a serious illness, during which time he was largely unable to carry out his duties and was deputised at Court by the Rector, Sir Iain Colquhoun.