Francis Barber (c. 1742/3 – 13 January 1801), born Quashey, was the Jamaican manservant of Samuel Johnson in London from 1752 until Johnson's death. Johnson made him his residual heir, with £70 a year to be given him by Trustees, expressing the wish that he move from London to Lichfield, in Staffordshire, Johnson's native city. After Johnson's death, Barber did this, opening a draper's shop and marrying a local woman. Barber was also bequeathed Johnson's books and papers, and a gold watch. In later years he had acted as Johnson's assistant in revising his famous Dictionary of the English Language and other works. Barber was also an important source for Boswell concerning Johnson's life in the years before Boswell himself knew Johnson.
Barber was born a slave in Jamaica on a sugarcane plantation belonging to the Bathurst family. His original name was Quashey, which was a common name for a male slave.
At the age of about 15, he was brought to England by his owner, Colonel Richard Bathhurst, whose son, also called Richard, was a close friend of Johnson. Barber was sent to school in Yorkshire. Johnson's wife Elizabeth died in 1752, plunging Johnson into a depression that Barber later vividly described to James Boswell. The Bathursts sent Barber to Johnson as a valet, arriving two weeks after her death. Although the legal validity of slavery in England was ambiguous at this time (with Somersett's Case of 1772 clarifying that it did not exist in England), when the elder Bathurst died two years later he gave Barber his freedom in his will, with a small legacy of £12 (equivalent to £2,000 in 2015). Johnson himself was an outspoken opponent of slavery, not just in England but in the American colonies as well.