Eustace Edward Ricardo Braithwaite, publishing as E. R. Braithwaite, was a Guyanese-born British-American novelist, writer, teacher and diplomat best known for his stories of social conditions and racial discrimination against black people. He was the author of the 1959 autobiographical novel To Sir, With Love, which was made into a 1967 British drama film of the same title, starring Sidney Poitier and Lulu. The narrator is an engineer, but to make ends meet, he accepts the job of teacher in a rough London school.

To Sir, With Love is a 1959 autobiographical novel by E. R. Braithwaite set in the East End of London. The novel is based on the true story of Braithwaite accepting a teaching post in a secondary school. The novel, in 22 chapters, gives insight into the politics of race and class in postwar London.