| Shag Thompson | |
| Position: | Outfielder |
| Bats: | Left |
| Throws: | Right |
| Birth Date: | April 29, 1893 |
| Birth Place: | Haw River, North Carolina |
| Death Place: | Black Mountain, North Carolina |
| Debutleague: | MLB |
| Debutdate: | June 8 |
| Debutteam: | Philadelphia Athletics |
| Finalleague: | MLB |
| Finaldate: | May 17 |
| Finalteam: | Philadelphia Athletics |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .203 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 4 |
| Teams: |
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James Alfred "Shag" Thompson was a Major League Baseball outfielder. He played parts of three seasons in the majors, from until .He played mostly for the Philadelphia Athletics. An avid ball player he was, he also enjoyed the managerial aspect of the game. Later in life, he went on to be the General Manager and co-owner of The Somerset Patriots, a minor league ball club based in Somerset, New Jersey.
Thompson was expected to be a mainstay of the 1916 Philadelphia Athletics, but he was released after starting the season with no hits in 17 at-bats. Prior to his death in 1990, Thompson was the last living player to have played on the pitiful 1916 A's--a team often regarded as the worst MLB club of the 20th century.
He excelled in his coaching career and eventually started two youth baseball leagues in nearby Flemington, New Jersey. He then became involved in suburban development by purchasing large plots of farm land and constructing neighborhoods. Hedgerow Estates, Stanton Ridge, and Cushetunk are three of his many suburban developments he helped found.