Lincoln “Linc” Isham (June 8, 1892 – September 1, 1971) was a descendant of Abraham Lincoln. He was one of three great-grandchildren of Abraham Lincoln and the only child of Mary "Mamie" Lincoln.

He married Leahalma “Lea” Correa on August 30, 1919, but they onley had a stepdaughter Frances Mantley. Noteworthy he left most of his property to the Red Cross and American Cancer Society.

Biography
Isham was born to Mary "Mamie" and Charles Bradford Isham. A drop out of Harvard, a newspaper once said "his frail body was unequal to the strain". Later on, Isham was said to have been a secret operative for the U.S. government in World War II.

On August 30, 1919, Isham married Leahalma "Lea" Correa, a New York ‘Society Girl of Sephardic Spanish Descent’, and helped raise her daughter, Frances Mantley. He was a frequent visitor at Hildene. Once when he was young, he was allowed to drive his grandfather Robert Todd Lincoln's 1905 Thomas Automobile, but rolled it in a ditch.

Later in his life, Isham and his wife settled in Dorset, Vermont where they owned a 22-acre (9 ha) farm. A talented amateur musician, he would often play music while his wife wrote children’s stories. On September 1, 1971 at 12:30 am, Lincoln Isham died at Putnam Memorial Hospital at the age of 79. He left most of his estate to the Red Cross, Salvation Army, and American Cancer Society. He also left a US$440,000 trust fund for his stepdaughter, and sent his grandmother's ‘Chicken Leg Coffee Set’ and ‘White House china’ to the Smithsonian. The rest of his family artifacts were auctioned off.