Sharon Kristin Nelson (née Harmon; June 25, 1945 – April 27, 2018) was an American primitive painter, actress and author, once married to the actor and musician Ricky Nelson.

Daughter of the American football star Tom Harmon and actress/model Elyse Knox, her younger siblings are model-actress Kelly Harmon and actor Mark Harmon.

Aged 17, she married Nelson in 1963 and joined their family television show. The couple had four children, but their extravagant lifestyle forced Nelson to tour for long periods, placing great pressure on the marriage. A long-fought divorce was finally granted before Rick Nelson's death in an air-crash in 1985.

In 1988, she married Mark Tinker, who encouraged her to paint. Her brightly colored primitives found favor with Jacqueline Kennedy and Mia Farrow, among other celebrities, and they form the basis of her coffee-table autobiography Out of My Mind.