Ronald Brunlees McKerrow FBA (12 December 1872 – 20 January 1940) was one of the leading bibliographers and Shakespeare scholars of the 20th century.

[1] R. B. McKerrow was born in Putney, Surrey, son of Alexander McKerrow, a civil engineer, and Mary Jane Brunlees, daughter of Sir James Brunlees, a president of the Institution of Civil Engineers.

[2] His paternal grandfather was William McKerrow, a noted cleric in the Presbyterian Church.

During the First World War McKerrow taught in the English Department at King's College, London (until 1919).

He held the Sandars Reader in Bibliography at Cambridge University in 1928 speaking on "The relationship of English printed books to authors’ manuscripts in the 16th and 17th centuries."