Misty of Chincoteague (20 July 1946 – 16 October 1972) was a Chincoteague Pony made famous by the children's novel Misty of Chincoteague by pony book author Marguerite Henry.

Misty of Chincoteague was foaled on 20 July 1946 at Beebe Ranch on Chincoteague Island, Virginia, United States. Her sire was the chestnut pinto stallion Pied Piper, and her dam was the smoky black pinto mare Phantom. Both of her parents were Chincoteague ponies. Misty grew to be a 12 hands (48 inches, 122 cm) palomino pinto with a marking on her left side, resembling a map of the United States, and a blaze shaped like the state of Virginia. She bred by Clarence Beebe and Ida Beebe, the owners of Beebe Ranch.

Shortly after Misty's birth in 1946, famed children's book and pony book author Marguerite Henry visited Chincoteague Island for the annual Pony Penning, looking for a story for her next book. While staying on the island, Henry met the Beebes, as well as Phantom and her foal, Misty. Henry offered to buy Misty, with the aim of using the foal as the model for her next pony book cover, but the Beebes refused. Eventually, the Beebes relented, and sold Misty to Henry after Henry promised that she would include their grandchildren, Maureen and Paul Beebe, in her next book. Henry purchased Misty for $150. Misty arrived at Henry's residence at Mole Meadow in Wayne, Illinois, on 18 November 1946.

Misty stayed with Henry for over a decade, making appearances at schools, movie theaters, museums, libraries, and horse shows to promote Henry's 1947 children's book, Misty of Chincoteague. Henry kept Misty with Friday, a Morgan horse that Henry used as her personal mount; and Jiggs, a donkey who also served as the cover model for Henry's 1953 children's novel, Brighty of the Grand Canyon. Misty was trained to both ride under saddle and to perform tricks, such as standing on a stool and "shaking hands", which she became famous for. Misty was the only equine member of the American Library Association (ALA), and Henry would bring Misty to their conventions. After Misty of Chincoteague became a bestseller, publisher Rand McNally rewarded Clarence Beebe with a $350 check as an additional "thank-you" for selling Misty to Henry as a foal.

After 11 years of touring and making appearances, Misty was retired to Beebe Ranch in 1957, where she became a broodmare. She would later become immortalized through the pony book genre and the 1961 film adaptation Misty, which was based on Henry's 1947 novel. Misty has gone on to become one of the icons of Chincoteague Island, Virginia, and the main ambassador for the Chincoteague Pony horse breed. She died peacefully in her sleep of natural causes on 16 October 1972, aged 26.

After her death, Misty was taxidermied by Charles Oxenham, and put on display at the Beebe Ranch in Chincoteague, Virginia. She was later moved to the Museum of Chincoteague Island, run by the Misty of Chincoteague Foundation, after a refurbishment in 1996.

Misty would serve as a conformational example of the "Traditional Type", or "Classic Type", of Chincoteague Pony in terms of anatomy: A solid stock pony type that was sound, with some flaws that were typical for range-bred horses, such as having a blocky head; being long-backed; a bit downhill, with a very thick neck and prominent withers, or "mutton-withered"; no freedom of the jowls; a bit straight in the hinds; having a sloped croup, with a middle-to-low-set tail; and being a little over at the shoulder.

Misty possessed a versatile and sturdy build, with short, thick legs. Many of her descendants are used as riding ponies and show ponies today, and Misty has become one of the most famous and prominent foundation broodmares in the Chincoteague Pony horse breed.