Geraldine Bonner (pen name, Hard Pan; 1870–1930) was an American author.
Geraldine Bonner was born on Staten Island, New York. Her father, John Bonner, was a journalist and historical writer. As a child, the family moved to Colorado and she lived in mining camps. After moving to San Francisco, California, she worked at a newspaper, the Argonaut, in 1887, and subsequently, she wrote the novel Hard Pan (1900) and used the name "Hard Pan" as a pseudonym. Bonner also wrote short stories which were published in Collier's Weekly, Harper's Weekly, Harper's Monthly, and Lippincott's.
- Tomorrow's Tangle, (1902)
- The Pioneer, (1905)
- The Castlecourt Diamond Case, (1906)
- The Book of Evelyn, (1913)
- The Girl at Central, (1914)
- The Black Eagle Mystery, (1916)
- Treasure and Trouble Therewith, (1917)
- Miss Maitland, Private Secretary, (1919)
- Works by Geraldine Bonner at Project Gutenberg
- Works by or about Geraldine Bonner at Internet Archive
- Works by Geraldine Bonner at LibriVox (public domain audiobooks)