John Jacob Loud (November 2, 1844 – August 10, 1916) was an American inventor known for designing the first ballpoint pen.
Trained as a lawyer at Harvard College, Loud worked at the Union National Bank in Weymouth, Massachusetts as a cashier.
He was also active in his community as a member of his church, a trustee of many local organizations, and as a member of local historical societies.
Loud invented and obtained a patent for what is considered to be the first ballpoint pen in 1888; however his invention was not commercialized and the patent would eventually lapse.
The modern ballpoint pen would be patented later in 1938 by László BÃró, 22 years after Loud's death.