Novels:
* "The Gentleman in Black" (1866) - A gothic mystery novel featuring a mysterious gentleman in black who investigates a murder.
* "The Elixir of Life" (1864) - A fantasy novel exploring the themes of immortality and the search for the elixir of life.
* "Harry Austyn" (1863) - A historical novel set in the early 19th century, focusing on the life of a young man and his experiences with love, loss, and ambition.
* "A Traitor in the Camp" (1871) - A historical novel set during the American Civil War, exploring the complexities of loyalty and betrayal.
* "The Silver King" (1882) - A melodrama about a man accused of murder, exploring themes of innocence and redemption.
Poetry:
* "The Poetical Works of Rudolph Lehmann" (1875) - A collection of Lehmann's poems, including lyrical pieces, ballads, and sonnets.
Other Works:
* "The Life of Henry Morley" (1898) - A biography of the English author and scholar Henry Morley.
* "The Reminiscences of Rudolph Lehmann" (1902) - An autobiography in which Lehmann recounts his life and experiences.
* Numerous essays and articles on topics ranging from literature and art to politics and social issues.
Lehmann's writing was often characterized by its vivid imagery, romantic sensibility, and exploration of complex human emotions. His works were popular in his time and continue to be of interest to readers today.