- Manual of the Mollusca, A; or, a Rudimentary Treatise of Recent and Fossil Shells1
- Martin Chuzzlewit1
- Memoirs of My Youth1
- Memoirs of a Physician1
- Memorials of Thomas Hood1
- Miscellanies2
- Miscellanies: Prose and Verse1
- Mission, The; or, Scenes in Africa1
- Missionary Travels and Researches in South Africa: Including a Sketch of Sixteen Years' Residence in the Interior of Africa1
- Monarchs of the Main, The; or, Adventures of the Buccaneers2
- Mr Sponge's Sporting Tour1
- National Rifle-Shooting Match. The Royal Rifle Match on Wimbledon Common: With Specialities of Rifles and Rifle Ammunition, and a Full Account of What Has Been Done in Competitive Rifle-Shooting1
- Naval Sketch-Book; or, the Service Afloat and Ashore1
- Nightshade1
- Now and Then1
- Oliver Cromwell's Letters and Speeches1
- Oliver Ellis; or, the Fusiliers1
- On Heroes and Hero-Worship1
- Oriental and Western Siberia; A Narrative of Seven Years' Explorations and Adventures in Siberia, Mongolia, the Kirqhis Steppes, Chinese Tartary, and Part of Central Asia1
- Out with Garibaldi; or, From Melazzo to Capua1