| Name | NBC Team | Last MLB Team | Last MLB Year |
|---|---|---|---|
| John Lackey | Elkhart, KS | Chicago Cubs | 2017 |
| John McMillon | Santa Barbara Foresters | Kansas City Royals | |
| John Moses | Boulder Collegians | Seattle Mariners | 1992 |
| John Oldham | Humboldt Crabs | Cincinnati Reds | 1956 |
| John Olerud | Kenai Peninsula Oilers | Boston Red Sox | 2005 |
| John Poloni | Boulder Collegians | Texas Rangers | 1977 |
| John Russell | Anchorage Glacier Pilots | Texas Rangers | 1993 |
| John Valentin | Colorado Springs, CO | New York Mets | 2002 |
| John Vander Wal | Grand Rapids, MI | Cincinnati Reds | 2004 |
| Johnnie Pesky | Silverton, OR | Washington Senators | 1954 |
| Johnny Lanning | Ft. Riley, KS | Boston Braves | 1947 |
| Johnny O’Brien | Matsu Miners | Philadelphia Phillies | 1959 |
| Johnny Sturm | Kearns, UT | New York Yankees | 1941 |
| Jon Zuber | Matsu Miners | Philadelphia Phillies | 1998 |
| Jonathan Papelbon | Silver Spring, MD | Boston Red Sox | 2016 |
| Jordan Danks | Austin, TX | Philadelphia Phillies | 2015 |
| Jordan Luplow | Anchorage Glacier Pilots | Philadelphia Phillies | |
| Jorge Posada | Hartselle, AL | New York Yankees | 2011 |
| Jose Alvarez | Clarinda A’s | Atlanta Braves | 1989 |
| Jose Tolentino | Matsu Miners | Houston Astros | 1991 |
| Jose Torres | Palm Springs Power | San Diego Padres | 2017 |
| Josh Barfield | Houston, TX | Cleveland Indians | 2009 |
| Josh Harrison | Cincinnati Steam | Cincinnati Reds | |
| Josh Satin | Matsu Miners | New York Mets | 2014 |
| Josh Whitesell | Orange County Scorpions | Arizona Diamondbacks | 2009 |
| Juan Eichelberger | Anchorage Bucs | Atlanta Braves | 1988 |
| Justin Atchley | Everett Merchants | Cincinnati Reds | 2001 |
| Justin Baughman | Tacoma Timbers | Anaheim Angels | 2000 |
| Justin Lehr | Santa Barbara Foresters | Cincinnati Reds | 2009 |
| Justin Leone | Tacoma Timbers | San Diego Padres | 2006 |
| Justin Wilson | Santa Barbara Foresters | New York Yankees |