James Michael Slattery (July 29, 1878 – August 28, 1948) was a United States senator from Illinois.

He was admitted to the bar that year and commenced practice in Chicago, and was a member of the Illinois College of Law faculty from 1909 to 1912.

He was superintendent of public service of Cook County, Illinois from 1910 to 1912 and was secretary of Webster College of Law in Chicago from 1912 to 1914.

Slattery was an unsuccessful candidate in the special election to fill the vacancy, and resumed the practice of law in Chicago.

He died at his summer home at Lake Geneva, Wisconsin and was interred in Calvary Cemetery, Evanston, Illinois.