| Harold Dadford West | |
| Birth Date: | July 16, 1904 |
| Birth Place: | Flemington, New Jersey |
| Death Place: | Nashville, Tennessee |
| Nationality: | American |
| Field: | biochemistry |
| Known For: | threonine |
Harold Dadford West (July 16, 1904 – March 5, 1974) was an American biochemist who was the first to synthesize threonine. Born in New Jersey, his father George, was from Washington D.C. and his mother, Mary, was from Rhode Island. He worked at Meharry Medical College in Nashville, Tennessee as a teacher. He was married to Jessie Juanita West and had at least two children, Edna (named after his older sister) and Harold West Jr. He died in 1974 in Nashville, Tennessee.