"One Word" is a song by British singer Kelly Osbourne, released as the first and only single from her second studio album, Sleeping in the Nothing (2005), in May 2005. Unlike the pop-punk sound Osbourne sported in the past, "One Word" is a synthpop song that showed Osbourne embracing dance music. To date it is Osbourne's last single release.

Kelly Michelle Lee Osbourne is an English television personality, singer, actress, model, and fashion designer. The daughter of Ozzy and Sharon Osbourne, she appeared on the reality show The Osbournes (2002–2005) with her family, for which they won a 2002 Emmy Award for Outstanding Reality Program. In 2009, she was a contestant on the dancing competition show Dancing with the Stars, in which she and her professional dance partner Louis van Amstel took third place. Osbourne was a presenter on Project Catwalk (2007–2008) and Fashion Police (2010–2015) and a judge on Project Runway Junior (2015–2017) and Australia's Got Talent (2016). She also played the voice role of Hildy Gloom in the Disney XD animated series The 7D (2014–2016).