Louis Heilprin (1851–1912) was a Hungarian American author, historian, and encyclopedia editor. He was born in Miskolc, Hungary in 1851. His father, Michael, son of Phineas Mendel, was also an encyclopedist and scholar of Hebrew history and literature and a follower of Lajos Kossuth. He had a younger brother Angelo who was a professor at the Philadelphia Academy of Sciences and two sisters. The family left Hungary as refugees in 1856. Heilprin was educated by his father.