Noble Winfield Threewitt (February 24, 1911 – September 17, 2010) was an American Thoroughbred racehorse trainer who conditioned horses for 75 years before retiring on his 96th birthday.

Born in Benton, Illinois, Threewitt grew up in a small town where his father worked as a bookkeeper for a coal company.

Trainer Warren Stute told reporter Julie Sarno of the Del Mar Times newspaper that "Noble [Threewitt] has done more for the grooms and backstretch workers than all of us put together.

He served six terms as president of the California Horsemen's Benevolent Association whose functions include the providing of free medical and dental benefits for stable workers and their families at a Santa Anita clinic.

In 2005, Noble Threewitt was the recipient of Hollywood Park's Laffit Pincay Jr. Award, given annually to someone who has served the sport of Thoroughbred racing with integrity, extraordinary dedication, determination, and distinction.