Joanne "Jo" Murray, OBE (née Rowling; born 31 July 1965), better known under the pen name J. K. Rowling, is a British author best known as the creator of the Harry Potter fantasy series, the idea for which was conceived whilst on a train trip from Manchester to London in 1990. The Potter books have gained worldwide attention, won multiple awards, and sold more than 400 million copies.

Aside from writing the Potter novels, Rowling is perhaps equally famous for her "rags to riches" life story, in which she progressed from living on welfare to multi-millionaire status within five years. The 2008 Sunday Times Rich List estimated Rowling's fortune at £560 million ($798 million), ranking her as the twelfth richest woman in Britain. Forbes ranked Rowling as the forty-eighth most powerful celebrity of 2007, and Time magazine named her as a runner-up for its 2007 Person of the Year, noting the social, moral, and political inspiration she has given her fandom. She has become a notable philanthropist, supporting such charities as Comic Relief, One Parent Families, Multiple Sclerosis Society of Great Britain, and the Children's High Level Group.

Although she writes under the pen name "J. K. Rowling", pronounced rolling (/ˈroʊlɪŋ/), her name when her first Harry Potter book was published was simply "Joanne Rowling". Before publishing her first book, her publisher Bloomsbury feared that the target audience of young boys might be reluctant to buy books written by a female author. It requested that Rowling use two initials, rather than reveal her first name. As she had no middle name, she chose K. for Kathleen as the second initial of her pseudonym, from her paternal grandmother. The name Kathleen has never been part of her real name. Following her marriage, her legal name is Joanne Murray, which she uses when conducting her personal business. She calls herself "Jo" and says, "No one ever called me 'Joanne' when I was young, unless they were angry."