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Sylvia June Day (born March 11, 1973) is a Japanese American writer of romance novels. She also writes under the pseudonyms S.J. Day and Livia Dare. She is a number one bestselling author in 28 countries.

Day writes romance novels, speculative/paranormal fiction, historical fiction, and futuristic fiction (under the pseudonym Livia Dare). She has also published fiction under the pseudonym S. J. Day, and non-fiction.

She is the co-founder of Passionate Ink, a special interest chapter of Romance Writers of America (RWA), and served on RWA's Board of Directors from 2009-13. She was the 22nd President of RWA. Day presently serves on the Authors Guild Board of Directors.

She presents workshops for writing groups and has been a speaker at events such as the RT Booklovers Convention, Romance Writers of America's National Convention, and Comic-Con.