James Edward Johnstone
- Bats unknown, Throws unknown
Jim Johnstone was an American League umpire in 1902. He moved to the National League in 1903 and worked in that circuit through 1912. During that span, he officiated in the World Series in 1906 and 1909. He was later a Federal League umpire in 1915.
He pitched in the minor leagues from 1894 to 1900 before becoming an umpire.