- John P. Marquand: Marquand was a Pulitzer Prize-winning American novelist, best known for his works such as "The Late George Apley" and "Wickford Point."
- John C. Lodge: Lodge served as the Governor of Connecticut from 1951 to 1955 and later became the United States Ambassador to Spain from 1955 to 1961.
- John Sloan Dickey: Dickey was the President of Dartmouth College from 1945 to 1970. He was a distinguished educator and leader in American higher education.
- Robert P. Bass: Bass was a Republican politician and businessman from New Hampshire. He served as the Governor of New Hampshire from 1911 to 1913.
- John Hay: Hay was an American statesman, diplomat, and writer who served as the United States Secretary of State under Presidents William McKinley and Theodore Roosevelt.
- Richard Eberhart: Eberhart was an American poet and educator. He was awarded the Pulitzer Prize for Poetry in 1966 for his collection "Selected Poems, 1930-1965."
- Robert F. Kennedy Jr.: Kennedy Jr. is an American environmental activist, author, and attorney. He is the son of former U.S. Senator Robert F. Kennedy and the nephew of President John F. Kennedy.
These are just a few examples of the distinguished individuals who have attended Kimball Union Academy and gone on to make significant contributions in their respective fields.