The Madness of King George is a 1994 British biographical comedy drama film directed by Nicholas Hytner and adapted by Alan Bennett from his own 1991 play The Madness of George III. It tells the true story of George III of Great Britain's deteriorating mental health, and his equally declining relationship with his eldest son, the Prince of Wales, particularly focusing on the period around the Regency Crisis of 1788–89. Two text panels at the end of the film note that the colour of the King's urine suggests that he was suffering from porphyria, adding that the disease is "periodic, unpredictable and hereditary."

The Madness of King George won the BAFTA Awards in 1995 for Outstanding British Film and Best Actor in a Leading Role for Nigel Hawthorne, who was also nominated for the Academy Award for Best Actor. The film won the Oscar for Best Art Direction and was also nominated for Oscars for Best Supporting Actress for Mirren and Best Adapted Screenplay. Helen Mirren also won the Cannes Film Festival Award for Best Actress and Hytner was nominated for the Palme d'Or.

In 1999, the British Film Institute voted The Madness of King George the 42nd greatest British film of all time.

King George III's bout of madness in 1788 touched off the Regency Crisis of 1788 and triggered a power struggle between factions of Parliament under the Tory Prime Minister William Pitt the Younger and the reform-minded Leader of the Opposition Charles James Fox.

At first, the King's behaviour appears mildly eccentric. He is deeply concerned with the wellbeing and productivity of Great Britain and exhibits an encyclopaedic knowledge of the families of even the most obscure royal appointments. He is devoted to his loving wife, Queen Charlotte, and their large brood of 15 children. However, he is growing more unsettled, partly over the loss of America. His memory fails, his behaviour becomes erratic and hypersexual, he talks and talks, and his urine turns blue.

George, Prince of Wales, aggravates the situation, knowing that he will be named regent if the King becomes incapacitated. George chafes under his father's relentless criticism, and yearns for greater freedom, particularly when it comes to choosing a wife. He married the woman everyone believes to be his mistress, Mrs. Fitzherbert, in a secret ceremony in 1785. Without his father's consent, the marriage is illegal. Even with consent, it would remove him from the succession, because Fitzherbert is a Catholic. He knows that he has the moral support of Fox, whose agenda includes abolition of the slave trade and friendlier relations with America. Knowing how to exacerbate the King's behaviour, the Prince arranges a concert of music by Handel. The King reacts as expected, interrupting the musicians, speaking lasciviously to Lady Pembroke, and finally assaulting his son.

In a private moment, the King tells Charlotte that he knows something is wrong. They are brutally interrupted when the Prince has them separated, supposedly on the advice of physicians. Led by the Prince of Wales' personal physician, Dr. Warren, the King is treated using the medical practices of the time, which focus on the state of his urine and bowel movements and include painful cupping and purgatives.

Lady Pembroke recommends Dr. Francis Willis, who cured her mother-in-law. Willis uses novel procedures. At his farm in Lincolnshire, patients work to gain “a better opinion of themselves.” He observes to an equerry “To be curbed, thwarted, stood up to, exercises the character.” When the King insults him, foully, he is strapped into a chair and gagged. He will be restrained whenever he “swears and indulges in meaningless discourse” and “does not strive every day and always towards his own recovery”.

When the Prince has the King transferred to Kew, Charlotte watches as her beloved, bearded and wearing a soiled diaper and a straitjacket, struggles against being put in the coach. “Until you can govern yourself, you're not fit to govern others. And until you do so, I shall govern you,” Willis says. At Kew, the King spits soup at Willis, but gains control under the physician's intractable gaze.^{[lower-alpha 1]} Later, the King, properly dressed, feeds himself to a round of applause from staff—but the delusions persist.

The Whig opposition confronts Pitt's increasingly unpopular Tory government with a proposal that would give the Prince powers of regency. Baron Thurlow, the Lord Chancellor, obtains and suppresses proof of the marriage. Fox wins, and the Regency Bill is printed. Thurlow comes to see the King and joins in a moving reading of King Lear.^[4] “I have remembered how to seem...” the King muses. “What, what!” an expression he has not used in 6 months. His urine is yellow.

Thurlow and the King arrive at Parliament in time to thwart the bill. The King forces the Prince to admit his marriage and to put away Fitzherbert. With the crisis averted, all those who have witnessed his suffering are summarily dismissed, including Greville. Fitzroy observes: “To be kind does not commend you to kings.”

Cheering crowds welcome the royal family to St. Paul's Cathedral. Willis stands by, but the King dismisses him.

“We must be a model family,” he declares; George wants “something to do.” “Smile at the people, wave at them. Let them see that we're happy. That's why we're here.” Saluting, Willis disappears into the crowd, where Mrs. Fitzherbert also smiles, wistfully.

Alan Bennett insisted that director Nicholas Hytner and actor Nigel Hawthorne should be cast in the film version, after having acted in the play.^[6][7]

• 2nd – Peter Rainer, Los Angeles Times^[16]
• 8th – National Board of Review^[17]
• 10th – Kenneth Turan, Los Angeles Times^[16]
• Top 10 runner-ups (not ranked) – Janet Maslin, The New York Times^[18]
• Best of the year (not ranked) - Michael Medved, Sneak Previews^[19]

• BFI Top 100 British films