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.

[1] He was a descendant of Francis Loud, originally of Ipswich, Massachusetts, and Mayflower passengers William Brewster and John Alden.

Upon his father's death in 1874, Loud assumed his position as a cashier and remained in that post until his resignation in 1895 for health reasons.

[14] A noted orator, he spoke at many local events, including delivering an address upon the building of the first warship at the Fore River Shipyard in 1900.