Clara Louise Burnham was an American novelist. After the success of No Gentlemen (1881), other books followed, including A Sane Lunatic (1882), Dearly Bought (1884), Next Door (1886), Young Maids and Old (1888), The Mistress of Beech Knoll (1890), and Miss Bagg's Secretary (1892). The daughter of George Frederick Root, she wrote the text for several his most successful cantatas. The 1923 film, A Chapter in Her Life is based on Burnham's 1903 novel Jewel: A Chapter in Her Life. Born in Massachusetts, she died at the family home in Maine in 1927.

Clara Mulholland (1849–1934) was a writer who was born in Belfast but moved to England at an early age. In addition to being a prolific novelist since the 1880s, she wrote children's literature, plays, and was a translator from French into English.

Clara Reeve was an English novelist best known for the Gothic novel The Old English Baron (1777). She also wrote an innovative history of prose fiction, The Progress of Romance (1785). Her first work was a translation from Latin, then an unusual language for a woman to learn. She was a near-contemporary of the bluestockings ladies of Elizabeth Montague's circle.

Clara Tschudi was a Norwegian writer.

Clara Emma Amalia Viebig was a German author.

Clarence Budington "Bud" Kelland was an American writer. Prolific and versatile, he was a prominent literary figure in his heyday, and he described himself as "the best second-rate writer in America".

Clarence Shepard Day Jr. was an American author and cartoonist, best known for his 1935 work Life with Father.

Clarence Poe (1881–1964) was an American Progressive Era Southern editor, author, reformer, and segregationist.

Clarence Hawkes was an American author and lecturer, known for his nature stories and poetry. One of his most well-known works is his autobiography, titled "The Darkened Path: A Story of Blindness and Its Triumphs," published in 1918.

Clark Ashton Smith was an American writer and artist. He achieved early local recognition, largely through the enthusiasm of George Sterling, for traditional verse in the vein of Swinburne. As a poet, Smith is grouped with the West Coast Romantics alongside Joaquin Miller, Sterling, and Nora May French and remembered as "The Last of the Great Romantics" and "The Bard of Auburn". Smith's work was praised by his contemporaries. H. P. Lovecraft stated that "in sheer daemonic strangeness and fertility of conception, Clark Ashton Smith is perhaps unexcelled", and Ray Bradbury said that Smith "filled my mind with incredible worlds, impossibly beautiful cities, and still more fantastic creatures".