The Oxfordian theory of Shakespeare authorship contends that Edward de Vere, 17th Earl of Oxford, wrote the plays and poems of William Shakespeare. While historians and literary scholars overwhelmingly reject alternative authorship candidates, including Oxford, public interest in the Oxfordian theory continues. Since the 1920s, the Oxfordian theory has been the most popular alternative Shakespeare authorship theory.

Edward de Vere, 17th Earl of Oxford, was an English peer and courtier of the Elizabethan era. Oxford was heir to the second oldest earldom in the kingdom, a court favourite for a time, a sought-after patron of the arts, and noted by his contemporaries as a lyric poet and court playwright, but his volatile temperament precluded him from attaining any courtly or governmental responsibility and contributed to the dissipation of his estate.