Sylvester Bliss (1814–1863) was a Millerite minister; editor and author.

Sylvester Judd was a Unitarian minister and an American novelist.

Sylvester was a Russian writer, poet, and theologian. He was a student of Simeon of Polotsk.

Sylvester Mowry was an American politician, miner, and land speculator. He is best remembered as an early advocate for establishing the Arizona Territory. He was also a West Point graduate and officer of the United States Army who was later arrested as a traitor during the American Civil War.

Sylvester Rosa Koehler was a German-born American author and museum curator. He was the first curator of prints at the Museum of Fine Arts, Boston.

Sylvia Ann Hewlett is a Cambridge educated economist.

Sylvia Beach, born Nancy Woodbridge Beach, was an American-born bookseller and publisher who lived most of her life in Paris, where she was one of the leading expatriate figures between World War I and II.

Sylvia Celeste Browne was an American author who claimed to be a medium with psychic abilities. She appeared regularly on television and radio, including on The Montel Williams Show and Larry King Live, and hosted an hour-long online radio show on Hay House Radio.

Sylvia Alderyn Brownrigg is an American author. She is the author of seven books of fiction. Brownrigg's books have been on The New York Times notable fiction lists and Los Angeles Times and Kirkus books of the year. Her children's book, Kepler's Dream, published under the name Juliet Bell, was turned into an independent film in 2017. She won a Lambda Literary Award in 2002 for Pages for You and published the sequel to that book in 2017. Brownrigg's reviews and criticism have appeared in a wide range of publications, including The New York Times Book Review, The Times Literary Supplement, The Guardian, New Statesman, Los Angeles Times, and The Believer.

Sylvia Cassedy was an American novelist and poet, who is best known for her children's and young adult fiction.