John Silas Vann
- Bats Right, Throws Right
- Height 6' 0", Weight 186 lb.
- Debut June 11, 1913
- Final Game June 11, 1913
- Born June 7, 1890 in Fairland, OK USA
- Died June 10, 1958 in Shreveport, LA USA
John Vann played 16 seasons in the minors, coming to the majors for one game with the St. Louis Cardinals in 1913. For much of that year he played with the Sioux City Packers where he had one of highest batting averages on the team; teammate Josh Clarke, brother of Fred Clarke, led that team in batting.