- Location: Jamestown, NY
- League: New York-Penn League 1994-2014
- Affiliate: Detroit Tigers 1994-1998; Atlanta Braves 1999-2001; Florida Marlins 2002-2011; Miami Marlins 2012; Pittsburgh Pirates 2013-2014
- Ballpark: Russell E. Diethrick, Jr. Park
- Famous Alumni: Bubba Trammell, Gabe Kapler, Dave Roberts
The Jamestown Jammers played in the New York-Penn League from 1994 to 2014, where they were affiliated with four different major league teams. They played their home games at Russell E. Diethrick, Jr. Park in Jamestown, New York. After the 2014 season the team moved to Morgantown, WV and became the West Virginia Black Bears. A new Jamestown Jammers moved into Diethrick Park the following year as members of the summer collegiate Prospect League.