| Jim Middleton | |
| Position: | Pitcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 28 May 1889 |
| Birth Place: | Argos, Indiana |
| Death Place: | Argos, Indiana |
| Debutleague: | MLB |
| Debutdate: | April 18 |
| Debutyear: | 1917 |
| Debutteam: | New York Giants |
| Finalleague: | MLB |
| Finaldate: | September 18 |
| Finalyear: | 1921 |
| Finalteam: | Detroit Tigers |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 7–12 |
| Stat2label: | Earned run average |
| Stat2value: | 4.51 |
| Stat3label: | Strikeouts |
| Stat3value: | 40 |
| Teams: |
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James Blaine "Rifle Jim" Middleton (May 28, 1889 – January 12, 1974) was a professional baseball player. He was a right-handed pitcher over parts of two seasons (1917, 1921) with the New York Giants and Detroit Tigers. For his career, he compiled a 7–12 record in 51 appearances, with a 4.51 earned run average and 40 strikeouts.
He was born and later died in Argos, Indiana, at the age of 84.