Sidney Crain Roach (July 25, 1876 – June 29, 1934) was a U.S. Representative from Missouri.

He was admitted to the bar in 1897 and commenced practice at Linn Creek, Missouri.

[1] He served as member of the board of directors of the National Bank of Linn Creek in 1900–1924.

He served as chairman of the Committee on Expenditures in the Department of Justice (Sixty-eighth Congress).

He moved to St. Louis, Missouri, December 27, 1924, and resumed the practice of law.