| Kauko, Joni | Finland U21 |  Finland | Midfield |
| Kauppi, Kalle | Finland U21 | Finland | Midfield |
| Kauppinen, Ville | Haka (FIN) / Finland U21 | Finland | Goalkeeper |
| Kaurin, Leni | Stabæk (NOR) / Norway WOCO |  Norway | Forward |
| Kausarov, Ruslan | Russia U17 |  Russia | Midfield |
| Kavanagh, Cian | Republic of Ireland U17 |  Republic of Ireland | Midfield |
| Kavazaj, Enis | Albania U19 |  Albania | Midfield |
| Kaverin, Vitaliy | Metalurh Zaporizhya (UKR) / Ukraine U21 |  Ukraine | Forward |
| Kawashima, Eiji | Standard Liège (BEL) |  Japan | Goalkeeper |
| Kawaya, Andy | Belgium U17 |  Belgium | Forward |
| Kaya, Doga | Gençlerbirliği (TUR) |  Turkey | Midfield |
| Kaya, Onur | Charleroi (BEL) | Belgium | Midfield |
| Kayabaşi, Burak | Ankara (TUR) | Turkey | Forward |
| Kayacan Erdoğan | Eskişehirspor (TUR) | Turkey | |
| Kayal, Beram | Celtic (SCO) / Israel |  Israel | Midfield |
| Kayal, Dima | Israel WU17 | Israel | Midfield |
| Kayaoğlu, Nurettin | Kayserispor (TUR) | Turkey | |
| Kayumov, Dmitri | Spartak Moskva (RUS) / Russia U21 | Russia | Midfield |
| Kazaishvili, Valeri | Vitesse (NED) / Georgia U21 |  Georgia | Midfield |
| Kazakov, Nikolai | Kairat (KAZ) / Kazakhstan FUT |  Kazakhstan | Forward |
| Kazakov, Alexey | Vorskla (UKR) | Ukraine | Midfield |
| Kazlauskas, Donatas | Žalgiris (LTU) / Lithuania U19 |  Lithuania | Midfield |
| Kaźmierczak, Przemysław | Śląsk (POL) |  Poland | Midfield |
| Kaźmierczak, Monika | Poland WU19 | Poland | Midfield |
| Kaznaferis, Kostas | Aris (GRE) |  Greece | Midfield |
| Keane, Robbie | LA Galaxy (USA) / Republic of Ireland | Republic of Ireland | Forward |
| Keane, William | Man. United (ENG) / England U21 |  England | Forward |
| Keane , Michael | England U21 | England | Defender |
| Kearney, Shelby | Scotland WU19 |  Scotland | Forward |
| Kearns, Daniel | Rotherham (ENG) / Republic of Ireland U21 | Republic of Ireland | Midfield |
| Keatings, James | Celtic (SCO) | Scotland | Forward |
| Kebe, Jimmy | Reading (ENG) |  France | Forward |
| Kecojević, Ivan | Gaziantepspor (TUR) / Montenegro |  Montenegro | Defender |
| Kecskés, Ákos | Hungary U17 |  Hungary | Defender |
| Kedziora, Wojciech | Piast (POL) | Poland | Defender |
| Kędziora, Tomasz | Lech (POL) / Poland U19 | Poland | Defender |
| Kee, Billy | Burton (ENG) / Northern Ireland U21 |  Northern Ireland | Forward |
| Keenan, Keeva | Republic of Ireland WU17 | Republic of Ireland | Defender |
| Keene, James | Elfsborg (SWE) | England | Forward |
| Kefashvili, David | Georgia FUT | Georgia | Goalkeeper |
| Kehl, Sebastian | Dortmund (GER) |  Germany | Midfield |
| Kehrer, Thilo | Germany U17 | Germany | Defender |
| Keiler, Sergey | Kazakhstan U19 | Kazakhstan | Defender |
| Keinan, Dekel | M. Haifa (ISR) / Israel | Israel | Defender |
| Keipes, Catherine Marquerite | Luxembourg WOCO |  Luxembourg | Goalkeeper |
| Keita, Abdoulaye | Bordeaux (FRA) | France | Goalkeeper |
| Keita, Mohammed | Strømsgodset (NOR) / Norway U21 | Norway | Forward |
| Keita, Ladji | Nacional (POR) |  Senegal | Forward |
| Keita, Alphousseyni | Académica (POR) |  Mali | Midfield |
| Keithley, Priestley | England U17 | England | Defender |
