Koch Diamond is a baseball venue in St. Paul, Minnesota, United States It is home to the St. Thomas Tommies baseball team of the NCAA Division I Summit League.

The field opened in 2006 and is named for the former St. Thomas pitcher David Koch.

[1] The park is located along Cretin Avenue in the Union Park neighborhood of St. Paul.

The field is used as both a football and soccer practice facility along the outfield, which causes the centerfield fence to be the deepest in all of college baseball, at 465 feet.

[2] David Koch, for whom the venue is named, pitched for the St. Thomas baseball program in 1952.