A Journal of the Plague Year: Being Observations or Memorials, Of the most Remarkable Occurrences, As well Publick as Private, which happened in London During the last Great Visitation In 1665, commonly called A Journal of the Plague Year, is a book by Daniel Defoe, first published in March 1722. It is an account of one man's experiences of the year 1665, in which the bubonic plague struck the city of London in what became known as the Great Plague of London, the last epidemic of plague in that city. The book is told somewhat chronologically, though without sections or chapter headings, and with frequent digressions and repetitions.

Daniel Defoe was an English novelist, journalist, merchant, pamphleteer and spy. He is most famous for his novel Robinson Crusoe, published in 1719, which is claimed to be second only to the Bible in its number of translations. He has been seen as one of the earliest proponents of the English novel, and helped to popularise the form in Britain with others such as Aphra Behn and Samuel Richardson. Defoe wrote many political tracts, was often in trouble with the authorities, and spent a period in prison. Intellectuals and political leaders paid attention to his fresh ideas and sometimes consulted him.