Jacob Breda Bull (28 March 1853 – 7 January 1930) was a Norwegian author, journalist and editor.
He was the son of parish priest Mathias Bull (1815–1876) and Henriette Margrethe Breda (1817–1887).
He then served a year as a teacher at Nickelsen's Girls' School in Kristiania (now Oslo).
In April 1878 he founded the newspaper Dagen and subsequently earned his living as a journalist.
The story about the horse named Vesleblakken is based upon a childhood memory from the author's upbringing in Rendalen.