- KA Akureyri (Football)
- KAA Gent (Football)
- Kabul Province (Cricket)
- Kairat Almaty (Football)
- Kaisar Kyzylorda (Football)
- Kaiserslautern (Football)
- Kalmar FF (Football)
- Kalutara Town Club (Cricket)
- Kamil Szeremeta (Boxing)
- Kanchenjunga Warriors (Cricket)
- Kandy (Cricket)
- Kandy Customs Cricket Club (Cricket)
- Kandy Warriors (Cricket)
- Kangaroos (Australian Rules Football)
- Kansas (Basketball)
- Kansas (American Football)
- Kansas City Chiefs (American Football)
- Kansas City Current (Football)
- Kansas City Royals (Baseball)
- Kansas State (American Football)
- Kansas State (Basketball)
- Karachi Kings (Cricket)
- Karachi Region Blues (Cricket)
- Karachi Region Whites (Cricket)
- Karagümrük (Football)
- Karaikal Knights (Cricket)
- Kardemir Karabukspor (Football)
- Karen Chukhadzhian (Boxing)
- Karen Elizabeth Carabajal (Boxing)
- Karlbergs BK (Football)
- Karlsruher SC (Football)
- Karnataka (Cricket)
- Karnataka Women (Cricket)
- KAS Eupen (Football)
- Kash Ali (Boxing)
- Kasimpasa (Football)
- Kasımpaşa (Football)
- Katie Taylor (Boxing)
- Kayserispor (Football)
- Kazakhstan (Football)
- Kazakhstan (Tennis)
- Kazakhstan (Ice Hockey)
- Kazakhstan (Rugby Union)
- Kazakhstan U21 (Football)
- Kazakhstan Women (Football)
- Kazakhstan Women (Volleyball)
- Kazakhstan Women (Rugby Union)
- Kazuto Ioka (Boxing)
- Kecskemeti TE (Football)
- Keenan Carbajal (Boxing)
- Kei Women (Cricket)
- Keith (Football)
- Keith Thurman (Boxing)
- Kell Brook (Boxing)
- Kelty Hearts (Football)
- Kenichi Ogawa (Boxing)
- Kennesaw State (American Football)
- Kennesaw State (Basketball)
- Kenny's Young Stars (Basketball)
- Kenshiro Teraji (Boxing)
- Kent (Cricket)
- Kent & Sussex 2nd XI (Cricket)
- Kent 2nd XI (Cricket)
- Kent Football Ladies (Football)
- Kent State (American Football)
- Kent State (Basketball)
- Kent Women (Cricket)
- Kentucky (Basketball)
- Kentucky (American Football)
- Kenya (Football)
- Kenya (Cricket)
- Kenya (Rugby Union)
- Kenya Women (Cricket)
- Kenya Women (Volleyball)
- Kenya Women (Rugby Union)
- Kerala (Cricket)
- Kerala Super Kings (Cricket)
- Kerala Women (Cricket)
- Kerkyra (Football)
- Kerman Lejarraga (Boxing)
- Kerry (Hurling)
- Kerry (Gaelic Football)
- Kettering Town (Football)
- Kevin Johnson (Boxing)
- Kevin Lerena (Boxing)
- Keynsham Town Ladies (Football)
- Keyshawn Davis (Boxing)
- KF Dukagjini (Football)
- KF Egnatia (Football)
- KF Llapi (Football)
- KF Malisheva (Football)
- KF Tirana (Football)
- KF Vllaznia Shkodër (Football)
- KFUM (Football)
- Khabib Nurmagomedov (Mixed Martial Arts)
- Khalil Coe (Boxing)
- Khan Research Laboratories (Cricket)
- Kharagpur Blasters (Cricket)
- Khelaghar Samaj Kallyan Samity (Cricket)
- Khulna Division (Cricket)
- Khulna T20 (Cricket)
- Khulna Tigers (Cricket)
- Khyber Pakhtunkhwa (Cricket)
- Khyber Pakhtunkhwa 2nd XI (Cricket)
- KI Klaksvík (Football)
- Kid Galahad (Boxing)
- Kidderminster Harriers (Football)
- Kidderminster Harriers Women (Football)
- Kifisia (Football)
- Kiko Martinez (Boxing)
- Kildare (Hurling)
- Kildare (Gaelic Football)
- Kilkenny (Hurling)
- Kilmarnock (Football)
- Kilwinning Rangers (Football)
- King's Lynn Town (Football)
- King's Lynn Town Ladies (Football)
- Kings XI Punjab (Cricket)
- Kingsmen (Cricket)
- Kingstonian (Football)
- Kisvárda (Football)
- Kiwoom Heroes (Baseball)
- KK Partizan (Basketball)
- Knattspyrnufelag Reykjavikur (Football)
- Knights (Rugby League)
- Knights (Cricket)
- Knights Women (Rugby League)
- Knights Women (Cricket)
- Knowle Ladies (Football)
- Kolkata Heroes (Cricket)
- Kolkata Knight Riders (Cricket)
- Kolos Kovalivka (Football)
- Konyaspor (Football)
- Koper (Football)
- Korea (Hockey)
- Korea (Baseball)
- Korea DPR (Football)
- Korea Republic (Football)
- Korea Republic (Tennis)
- Korea Republic (Basketball)
- Korea Republic U20 (Football)
- Korea Republic Women (Football)
- Korea Republic Women (Cricket)
- Korea Republic Women (Lacrosse)
- Korea Republic Women (Volleyball)
- Korea Women (Hockey)
- Kosei Tanaka (Boxing)
- Kosovo (Football)
- Kosovo U21 (Football)
- Kosovo Women (Football)
- Kotli Lions (Cricket)
- Kowloon Cricket Club (Cricket)
- Kowloon Cricket Club Women (Cricket)
- Kowloon Lions (Cricket)
- KPV (Football)
- Krasnodar (Football)
- Krishananagar Challengers (Cricket)
- Kristiansund (Football)
- Kryvbas KR (Football)
- Krzysztof Glowacki (Boxing)
- KSC Lokeren (Football)
- KSI (Boxing)
- KSV Roeselare (Football)
- KTP (Football)
- Kubrat Pulev (Boxing)
- Kudratillo Abdukakhorov (Boxing)
- Kunduz Province (Cricket)
- KuPS (Football)
- Kurunegala Youth Cricket Club (Cricket)
- Kuwait (Football)
- Kuwait (Cricket)
- Kuwait Under-19s (Cricket)
- Kuwait Women (Cricket)
- KV Kortrijk (Football)
- KV Mechelen (Football)
- KV Oostende (Football)
- KVC Westerlo (Football)
- Kwanthai Sithmorseng (Boxing)
- KwaZulu-Natal (Cricket)
- KwaZulu-Natal Inland (Cricket)
- KwaZulu-Natal Inland Women (Cricket)
- KwaZulu-Natal Women (Cricket)
- Kyrgyzstan (Football)
- Kyzyl-Zhar (Football)