K
- Ryan Kalish
- Rudy Kallio
- Gabe Kapler
- Ed Karger
- Andy Karl
- Marty Karow
- Benn Karr
- Eddie Kasko
- George Kell
- Al Kellett
- Red Kellett
- Win Kellum
- Ed Kelly
- Ken Keltner
- Russ Kemmerer
- Fred Kendall
- Bill Kennedy
- John Kennedy
- Marty Keough
- Dana Kiecker
- Joe Kiefer
- Bobby Kielty
- Leo Kiely
- Jack Killilay
- Byung-Hyun Kim
- Sun-Woo Kim
- Ellis Kinder
- Walt Kinney
- Bruce Kison
- Billy Klaus
- Red Kleinow
- Bob Kline
- Ron Kline
- Bob Klinger
- Brent Knackert
- John Knight
- Hal Kolstad
- Cal Koonce
- Andy Kosco
- Casey Kotchman
- Mark Kotsay
- George Kottaras
- Jack Kramer
- Lew Krausse, Jr.
- Rick Kreuger
- Rube Kroh
- John Kroner
- Marty Krug
- Randy Kutcher
Read more about this topic: Boston Red Sox All-time Roster