A grownup is an adult.

Grownup may also refer to:

• Grown-Ups, a 1980 British BBC television film
• Grown Ups (1997 TV series), a British sitcom
• Grown Ups (1999 TV series), an American sitcom
• Grownups (2006 TV series), a British sitcom
• Grown Up (film), a 1993 short animated film by Joanna Priestley
• Grown Ups (film), a 2010 American comedy film
  • Grown Ups 2, the sequel film
• Grown Ups (band), a pop punk band from Chicago
• Grown Up (album), a 2010 album by By2
• Grown-Up (EP), a 2012 EP by F.T. Island
• "Grown Up", a 2012 single by Danny Brown
• "Grown Up", a 2016 single by Monni
• "The Grown-Ups" (Mad Men) a 2009 episode of the television show