Jordan Masterson (born April 9, 1986) is an American actor.
He played Zeb, a five-year-old boy, in Danielle Steel's 1993 TV adaptation Star.
He is perhaps best known for his role as Mark in the 2005 film The 40-Year-Old Virgin and his recurring role as Dumptruck in ABC Family comedy-drama series Greek.
He co-stars as Ryan Vogelson on the sitcom Last Man Standing on ABC (2012-2017) and FOX (2018-).
He also guest starred in the television series Grounded for Life, George Lopez, Las Vegas, 7th Heaven, CSI: Miami, Without a Trace and How I Met Your Mother.
Masterson is the brother of actress Alanna Masterson and the maternal half-brother of actors Danny Masterson and Christopher Masterson (Will Masterson is Danny and Christopher's paternal half-brother).