Gabrielle d'Estrées, Duchess of Beaufort and Verneuil, Marchioness of Monceaux (1573 – 10 April 1599) was a French mistress of King Henry IV of France, born at either the Château de la Bourdaisière in Montlouis-sur-Loire, in Touraine, or at the château de Cœuvres, in Picardy.

In 1591, Henry IV fell in love with Gabrielle d'Estrées. She became one of his many mistresses in the middle of his bitter struggle with the Catholic League. Although he was married to Marguerite de Valois, Henri and Gabrielle were openly affectionate with each other in public. Fiercely loyal, Gabrielle accompanied Henri during his campaigns. Even when heavily pregnant, she insisted on living inside his tent near the battlefield, making sure his clothing was clean and that he ate well after a battle, handling the day to day correspondence while he fought. As she was an intelligent and practical woman, Henri confided his secrets to her and followed her advice. When the two were apart, Henry frequently wrote her letters while on his sojourn trips at war camps.

Born a Catholic, Gabrielle knew that the best way to conclude the religious wars was for Henri himself to become a Catholic. Recognizing the wisdom in her argument, on 25 July 1593 Henri declared that "Paris is well worth a Mass" and permanently renounced Protestantism. This enabled him to be crowned King of France on 27 February 1594. Henri also arranged for Gabrielle's marriage to Liancourt to be annulled the same year.

On 7 June 1594, their first child was born, a son, César de Bourbon, future Duke of Vendôme. On 4 January 1595, Henri IV officially recognized and legitimized his son in a text validated by the Parlement de Paris. In that text, he also recognized Gabrielle d'Estrées as the mother of his son and as "the subject the most worthy of our friendship"; in other words, Henri IV had the Parlement de Paris officially ratify Gabrielle's position as his mistress. In 1596, he made her marquise de Monceaux and, the following year, duchesse de Beaufort.

Henri IV also recognized and legitimized two more children he had with Gabrielle: Catherine-Henriette de Bourbon, a daughter born in 1596, and Alexandre de Bourbon, a son born in 1598.

The relationship between Henri and Gabrielle did not sit well with some members of the French aristocracy, and malicious pamphlets circulated that blamed the new duchess for many national misfortunes. One of the most vicious nicknames ascribed to Gabrielle was la duchesse d'Ordure ("the Duchess of Filth").

Gabrielle became Henri's most important diplomat, using her female friends amongst the various Catholic League families to bring about peace. In March 1596, Henri gave both Gabrielle and his sister Catherine a set of gold keys which bestowed upon them seats on his council. This gift pleased Gabrielle so much that she took to wearing the little keys on a chain around her neck.

In 1598, Henri issued the Edict of Nantes, which gave the Huguenots certain rights while deferring to Catholics. Joining forces, the Huguenot Catherine and Catholic Gabrielle went to work overriding the objections of powerful Catholics and Huguenots and forcing compliance with the edict. Henri was so impressed with her efforts that he wrote "My mistress has become an orator of unequaled brilliance, so fiercely does she argue the cause of the new Edict."

After applying to Pope Clement VIII for an annulment of his marriage and authority to remarry, in March 1599 Henri gave his mistress his coronation ring. Gabrielle, so sure that the wedding would take place, stated, "Only God or the king's death could put an end to my good luck". A few days later, on 9 April, she suffered an attack of eclampsia and gave birth to a stillborn son. King Henri was at the Château de Fontainebleau when news arrived of her illness. The next day, 10 April 1599, while Henri was on his way to her, she died in Paris.

The king was grief-stricken, especially given the widely-held rumor that Gabrielle had been poisoned. He wore black in mourning, something no previous French monarch had done before. He gave her the funeral of a Queen; her coffin was transported amidst a procession of princes, princesses, and nobles to the Saint-Germain-l'Auxerrois church in Paris, for a requiem mass. Remembered in French history and song as La Belle Gabrielle, she was interred at the Notre-Dame-La-Royale de Maubuisson Abbey in Saint-Ouen-l'Aumône (Val-d'Oise, Île-de-France).

A publication after her death called the "Mémoires secrets de Gabrielle d'Estrée" (The Secret Memoirs of Gabrielle d’Estrée) is believed to have been written by one of her friends.

Her four children by Henry were:

 César, Duke of Vendôme (1594–1665), married Françoise de Lorraine (1592–1669) and had issue. In 1626, he participated in a plot against Cardinal Richelieu. César was captured and held in prison for three years. In 1641 he was accused of conspiracy again and this time fled to England.
 Catherine Henriette de Bourbon (1596–1663), married Charles II, Duke of Elbeuf.
 Alexandre, Chevalier de Vendôme (1598–1629).
 stillborn son (1599).

She is the presumed subject of the painting Gabrielle d'Estrées et une de ses sœurs by an unknown artist (c.1594). Gabrielle sits up nude in a bath, holding (presumably) Henry's coronation ring, whilst her sister sits nude beside her and pinches her right n***le. Henry gave Gabrielle the ring as a token of his love shortly before she died.

The painting now hangs at the Louvre Museum in Paris.

J.M.W.Turner painted a watercolour of "The Palace of the Fair Gabrielle" at Bougival (private collection, U.S.A.).
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