Robert Louis "Bob" Arnzen (born November 3, 1947) is a retired American basketball and baseball player.

Born in Covington, Kentucky, Arnzen graduated from St. Xavier High School in Cincinnati, Ohio in 1965.

Arnzen was selected by the Detroit Pistons in the 8th round (93rd pick overall) of the 1969 NBA draft.

Arnzen additionally played Minor League Baseball for the Gulf Coast Expos (1969), West Palm Beach Expos (1969–71), Winnipeg Whips (1971), Québec Carnavals (1972), and Peninsula Whips (1972).

Source[3] This biographical article relating to a United States basketball player, coach, or other figure born in the 1940s is a stub.