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- Kei Kamara, Sporting Kansas City
- Macoumba Kandji, Houston Dynamo
- Ryan Kawulok, Portland Timbers
- Robbie Keane, Los Angeles Galaxy
- Dan Keat, Los Angeles Galaxy
- Stephen Keel, New York Red Bulls
- Jon Kempin, Sporting Kansas City
- Dan Kennedy, Chivas USA
- Kosuke Kimura, Portland Timbers
- Stephen King, D.C. United
- Steven Kinney, Chicago Fire
- Greg Klazura, Vancouver Whitecaps FC
- Chris Klute, Colorado Rapids †
- Brad Knighton, Vancouver Whitecaps FC
- Perry Kitchen, D.C. United
- Danny Koevermans, Toronto FC
- Gershon Koffie, Vancouver Whitecaps FC
- Chris Konopka, Philadelphia Union
- Chris Korb, D.C. United
- Eric Kronberg, Sporting Kansas City
Read more about this topic: List Of Current Major League Soccer Players