Hosta

Sweet William may refer to:

• Dianthus barbatus, a species of flowering plant
• Mustelus antarcticus, a species of shark
• Sweet William (novel), a 1975 novel by Beryl Bainbridge
• Sweet William (film), a 1980 British drama film, based on the novel
• Sweet William (short story collection), a short story collection in the Just William series by Richmal Crompton
• "Lord William" or "Sweet William", a traditional Scottish folk ballad