Sir Harold Walter Bailey, FBA (16 December 1899 – 11 January 1996), who published as H. W. Bailey, was an eminent English scholar of Khotanese, Sanskrit, and the comparative study of Iranian languages.
Bailey was born in Devizes, Wiltshire, and raised from age 10 onwards on a farm in Nangeenan, Western Australia, without formal education. While growing up, he learned German, Italian, Spanish, Latin, and Greek from household books, and Russian from a neighbour. After he grew interested in the lettering on tea-chests from India, he acquired a book of Bible selections translated into languages with non-European scripts, including Tamil, Arabic, and Japanese. By the time he had left home, he was reading Avestan as well.
In 1921 he entered the University of Western Australia to study classics. In 1927, after completing his master's degree on Euripides, he won a Hackett Studentship to Oxford where he joined the Delegacy of Non-Collegiate Students, later St Catherine's College. There he studied under Frederick William Thomas.