Alan Douglas Ruck (born July 1, 1956) is an American actor. He is best known for portraying Cameron Frye in John Hughes's film Ferris Bueller's Day Off (1986), as well as his television roles as Stuart Bondek on the ABC sitcom Spin City (1996–2002) and Connor Roy on the HBO series Succession (2018–2023), the latter earning him a Primetime Emmy Award nomination.

His other film credits include Bad Boys (1983), Three Fugitives (1989), Young Guns II (1990), Speed (1994), and Twister (1996).

Early life
Ruck was born in Cleveland, Ohio, to a schoolteacher mother and a father who worked for a pharmaceutical company. He attended Parma Senior High School in Parma, Ohio, and graduated from the University of Illinois with a B.F.A. in drama in 1979. He recalled:

After school, I went up to Chicago, because I didn't really know anybody in New York or Los Angeles, and I knew people who were doing plays in Chicago. So I went up there, and I knocked around a little bit. And I guess about a year after I was out of school, I got my first job.

Ruck was interested in politics at a very young age. Ruck made his Broadway debut in 1985 in Neil Simon's Biloxi Blues with Matthew Broderick. He was soon a stage actor at theaters around the US, including the Wisdom Bridge Theatre in Chicago. In his initial foray into film, Ruck appeared in Class and Hard Knocks as well as some television films.