Susan Howlet Butcher (born December 26, 1954) is a dog musher who rose to fame when she became the second woman to win the Iditarod dog-sled race in 1986, and went on to become the second four time winner in 1990, and the first to win four out of five sequential years.

Butcher grew up in the city of Boston, Massachusetts, a lover of dogs and the outdoors. She studied at Colorado State University and ultimately became a veterinary technician. To pursue her love of dogsled racing and breeding huskies, she moved to the Wrangell Mountains area of Alaska.

Living in Alaska, Susan Butcher began training to compete in the Iditarod sled-dog race, a gruelling 1,049-mile race through arctic blizzard conditions across the Alaska wilderness, which tests the endurance of both mushers and dogs over the course of one to two weeks. After placing in several Iditarods, Butcher was forced to withdraw early in the 1985 when two of her dogs were killed by a moose, and six others were severly injured. Libby Riddles , a relative newcomer, braved a blizzard and became the first woman to win the Iditarod that year.

The more experienced Butcher won the next race in 1986, and then proceeded to win again in 1987, 1988, and 1990. Even in 1989, she placed second. While fellow four-time winners Martin Buser and Doug Swingley have won as many races as Butcher, and Rick Swenson has won five, no other competitor has so thoroughly dominated the sport over a half a decade.

She married fellow dog racer Dave Monson and they have successfully competed in almost every major sled-dog race in numerous countries around the world.

Her accomplishments made her a media darling in the late 1980s, and earned earned her many awards including the "National Women's Sports Foundation Amateur Athlete of The Year Award" and the "Tanquerey Athlete of the Year." She also won the "U.S. Victor Award" for Female Athlete of the Year two years in a row.