| Name | NBC Team | Last MLB Team | Last MLB Year |
|---|---|---|---|
| J.D. Drew | Kenai Peninsula Oilers, Team USA | Boston Red Sox | 2011 |
| J.J. Thobe | Matsu Miners | Montreal Expos | 1995 |
| J.T. Snow | Kenai Peninsula Oilers | San Francisco Giants | 2008 |
| Jack Daugherty | Matsu Miners | Cincinnati Reds | 1993 |
| Jack Fimple | Humboldt Crabs | California Angels | 1987 |
| Jack Graham | Kearns, UT | St. Louis Browns | 1949 |
| Jack Howell | Matsu Miners | Houston Astros | 1999 |
| Jack Kralick | Grand Rapids, MI | Cleveland Indians | 1967 |
| Jack Lazorko | Kenai Peninsula Oilers | California Angels | 1988 |
| Jack Sanford | Alpine, TX | Kansas City Athletics | 1967 |
| Jack Wilson | Hays Larks | Atlanta Braves | 2012 |
| Jackie Jensen | Atwater, CA | Boston Red Sox | 1961 |
| Jackson Todd | Fairbanks Goldpanners | Toronto Blue Jays | 1981 |
| Jacob Brumfield | Pascagoula, MS | Toronto Blue Jays | 1999 |
| Jacob Rhame | Anchorage Bucs | Los Angeles Angels | 2019 |
| Jacoby Ellsbury | Anchorage Glacier Pilots, Bend Elks | New York Yankees | 2017 |
| Jacque Jones | San Diego Mavericks, Team USA | Florida Marlins | 2008 |
| Jaime Bubela | Clarinda A’s | Seattle Mariners | 2005 |
| Jake Gibbs | West Point, MS | New York Yankees | 1971 |
| James Mouton | Clarinda A’s | Milwaukee Brewers | 2001 |
| James Paxton | Anchorage Glacier Pilots | Seattle Mariners | |
| James Shields | Santa Barbara Foresters | Chicago White Sox | 2018 |
| Jamey Carroll | Clarinda A’s | Kansas City Royals | 2013 |
| Jamie Allen | Anchorage Bucs | Seattle Mariners | 1983 |
| Jamie Bluma | Anchorage Bucs | Kansas City Royals | 1996 |
| Jamie McAndrew | Wichita, KS | Milwaukee Brewers | 1997 |
| Jan Dukes | Bellingham, WA | Texas Rangers | 1972 |
| Jared Sandberg | Kelowna Falcons | Tampa Bay Devil Rays | 2003 |
| Jason Bay | Kelowna Falcons | Seattle Mariners | 2013 |
| Jason Castro | Anchorage Bucs | Houston Astros | |
| Jason Ellison | Everett Merchants | Texas Rangers | 2008 |
| Jason Frasor | Matsu Miners | Kansas City Royals | 2014 |
| Jason Giambi | Anchorage Bucs | Cleveland Indians | 2014 |
| Jason Hammel | Wenatchee Apple Sox | Kansas City Royals | 2018 |
| Jason Jennings | Salina, KS | Texas Rangers | 2009 |
| Jason Lane | Anchorage Bucs | San Diego Padres | 2014 |
| Jason Phillips | Kelowna Falcons | Toronto Blue Jays | 2007 |
| Jason Thompson | Matsu Miners | San Diego Padres | 1996 |
| Jay Howell | Boulder Collegians | Texas Rangers | 1994 |
| Jed Hansen | Anchorage Bucs | Kansas City Royals | 1999 |