The Merry Wives of Windsor or Sir John Falstaff and the Merry Wives of Windsor is a comedy by William Shakespeare first published in 1602, though believed to have been written in or before 1597. The Windsor of the play's title is a reference to the town of Windsor, also the location of Windsor Castle in Berkshire, England. Though nominally set in the reign of Henry IV or early in the reign of Henry V, the play makes no pretence to exist outside contemporary Elizabethan-era English middle-class life. It features the character Sir John Falstaff, the fat knight who had previously been featured in Henry IV, Part 1 and Part 2. It has been adapted for the opera at least ten times. The play is one of Shakespeare's lesser-regarded works among literary critics. Tradition has it that The Merry Wives of Windsor was written at the request of Queen Elizabeth I. After watching Henry IV Part I, she asked Shakespeare to write a play depicting Falstaff in love.

Windsor is a historic town in the Royal Borough of Windsor and Maidenhead in Berkshire, England. It is the site of Windsor Castle, one of the official residences of the British monarch. The town is situated 21.8 miles (35.1 km) west of Charing Cross, central London, 5.8 miles (9.3 km) southeast of Maidenhead, and 15.8 miles (25.4 km) east of the modern county town of Reading. It is immediately south of the River Thames, which forms its boundary with its smaller, ancient twin town of Eton. The village of Old Windsor, just over 2 miles (3 km) to the south, predates what is now called Windsor by around 300 years. In the past, Windsor was formally referred to as New Windsor to distinguish the two.