Sean Llewellyn Williams (born 23rd May 1967) is a New York Times best selling science fiction author who lives in Adelaide, Australia. He was born in Whyalla, Australia. He is the author of over sixty published short stories and eighteen novels, including the Books of the Change and (with Shane Dix) the bestselling Evergence and Orphans trilogies. He has co-written three books in the Star Wars: New Jedi Order series and is a multiple recipient of both the Ditmar & Aurealis Award.

Sean Williams is a diverse and prolific author, simultaneously covering many different facets of the genre. His major works explore such areas as: cutting-edge science fiction dealing with major post-human issues including nanotechnology, biotechnology, longevity, artificial intelligence, the origins of life, and fundamental properties of the universe. He has also written gritty "future noir" hybrids portraying the possibilities of crime prevention and detection in the twenty-first century, plus possible outcomes of present day political, social and technological developments.

He studied sciences and music at Pulteney Grammar School and matriculated thirty third in his year (1984), topping the state for Musical composition. That same year, he won the Young Composer's Award for a theme and three variations for string quartet with flute, oboe and trumpet soloists called "Release of Anger". He then went to Adelaide University and studied a Bachelor of Economics and wrote for the student newspaper On Dit.

Sean Williams is a supporter of Australians Against Racism and the SETI@home project. He is a member of SFWA, the Extropian Institute and the Australian Society of Authors, and was Chair of the SA Writers' Centre from 2001-2003. His publishers include HarperCollinsAustralia, Del Rey, Ace, Pyr, Swift and Ticonderoga Publications. He is proud to appear on the Celebrity Atheist List. Sean has also tutored for the Clarion Workshop.

Sean Colin Williams (born 26 September, 1986 in Bulawayo) is a Zimbabwean cricketer who captained his country at the 2006 Under–19 World Cup. Williams, a left-handed batsman and occasional slow left arm bowler, has a highest score of 70 not out against the West Indies in the match played between the nations at the 2007 World Cup, and has taken 7 wickets in his 16 One-Day Internationals.

In first-class cricket, Williams plays for Westerns, formally known as Matabeleland. His highest score is 129.

Sean Williams (b. 1959, Berkeley, California) is an ethnomusicologist who teaches at The Evergreen State College in Olympia, Washington.

Her primary areas of teaching include Irish studies and Asian studies; she leads the Sundanese music ensemble Gamelan Degung Girijaya (Enduring Mountain Gamelan). She received a BA in classical guitar performance from UC Berkeley in 1981, and an MA (1985) and Ph.D. (1990) in ethnomusicology from the University of Washington (Seattle).

She is a co-editor, with Dr. Terry E. Miller, of the Garland Encyclopedia of World Music (Southeast Asia volume), and The Garland Handbook of Southeast Asian Music, a version of the Encyclopedia reduced to textbook size with supplemental material on the internet. She has written numerous articles about music in Indonesia, Ireland, and Japan. Her first book, The Sound of the Ancestral Ship: Highland Music of West Java (Oxford 2001) is an academic monograph about Sundanese aristocratic sung poetry of Indonesia. Her second book, The Ethnomusicologists' Cookbook: Complete Meals from Around the World (Routledge 2006), is an edited volume joining recipes with articles about food and music in 47 different regions of the world. Her current book (with co-writer Lillis O'Laoire) is a biography of the great Irish singer and storyteller, Joe Heaney (Oxford, forthcoming), titled Bright Star of the West: Joe Heaney, Irish Song-Man. She is a member of the Society for Ethnomusicology (former board member), the Society for Asian Music, and other music-and-culture-related societies.

Sean Williams is also a musician; she plays numerous Indonesian instruments along with the classical guitar, Irish fiddle, and banjo. She sings in Irish and English.

Sean Williams (born September 13 1986, in Houston, Texas) is an American basketball player for the NBA's New Jersey Nets. He is a 6'10" forward/center and a highly athletic shot blocker.