| K. K. Hof-Burgtheater | K. K. Hof-Burgtheater | 1896 | 3 | 1 |
| K.V. Het Nederlandsch Tooneel | K.V. Het Nederlandsch Tooneel | 1889 | 14 | |
| Kalužskij oblastnoj dramatičeskij teatr | Kalužskij oblastnoj dramatičeskij teatr (Kaluga Regional Drama Theatre) | 1982 | 1 | |
| Kammerspiele Berlin | Kammerspiele Berlin | | | |
| Kammerspiele Landshut | Kammerspiele Landshut | 2006 – 2007 | 3 | |
| Kansai Shingeki Kyokai (Kansai New Theatre Society) | Kansai Shingeki Kyokai (Kansai New Theatre Society) | 1914 | 1 | |
| Kappa | Kappa | 1980 | 1 | |
| Karin Swanström-Tourneen | Karin Swanström-Tourneen | 1906 | 1 | |
| KARO FATAK | KARO FATAK | 2025 | 1 | |
| Katemo Kathu Players | Katemo Kathu Players | 2010 | 1 | |
| Kattas Figurteater Ensemble | Kattas Figurteater Ensemble | 2011 | 8 | |
| Kavaná Produções | Kavaná Produções | 2022 – 2024 | 6 | |
| Kawakami Troupe, The | The Kawakami Troupe | 1911 | 1 | |
| Kazamidori | Kazamidori | 1986 | 1 | |
| KCRW (Radio) | KCRW (Radio) | | | |
| Kementerian Pendidikan, Kebudayaan, Riset, dan Teknologi | Kementerian Pendidikan, Kebudayaan, Riset, dan Teknologi (Ministry of Education, Culture, Research, and Technology) | 2019 | 1 | |
| Kenkyuza | Kenkyuza | 1923 | 1 | |
| Kent State University Repertory Company | Kent State University Repertory Company | 1968 | 1 | |
| Kiln Theatre | Kiln Theatre | 2019 | 1 | |
| Kindaigeki Kyokai (The Modern Theatre Society) | Kindaigeki Kyokai (The Modern Theatre Society) | 1912 – 1914 | 3 | |
| King's College Drama Club | King's College Drama Club | 2002 | 1 | |
| Kinkasha | Kinkasha | 1997 | 1 | |
| Kirsten Flagstad Festival | Kirsten Flagstad Festival | 2006 | 1 | |
| Kitchen Theatre Company | Kitchen Theatre Company | 2003 | 1 | |
| Kitchener Waterloo Little Theatre | Kitchener Waterloo Little Theatre | 2003 | 1 | |
| Kjøbenhavns frie Teater | Kjøbenhavns frie Teater | 1897 | 1 | |
| KK Het Nederlandsche Tooneel, AFD. Rotterdam | KK Het Nederlandsche Tooneel, AFD. Rotterdam | 1884 | 1 | |
| Kleines Theater | Kleines Theater | 1905 | 1 | |
| Klia | Klia | 2023 | 1 | |
| Knox College | Knox College | 2006 | 1 | |
| Knut Lindroth - turnén | Knut Lindroth - turnén | 1914 | 3 | |
| Knut Lindroths sällskap | Knut Lindroths sällskap | 1907 – 1908 | 5 | |
| Koiton Nayttamo | Koiton Nayttamo | 1922 | 1 | |
| Kokkolan kaupunginteatteri | Kokkolan kaupunginteatteri | 1921 – 2006 | 2 | |
| Kollektiv Színtársulat, A | A Kollektiv Színtársulat | 1919 | 1 | |
| Kółko Dramatycne | Kółko Dramatycne | 1910 | 1 | |
| Kondaba | Kondaba | 2025 | 1 | |
| Kongelige norske marines musikkorps | Kongelige norske marines musikkorps | 2013 | 1 | |
| Kongelige Teater, Det | Det Kongelige Teater | 1870 – 2025 | 388 | 4 |
| Kongsvinger Amatørteater | Kongsvinger Amatørteater | 2002 – 2007 | 3 | |
| Kraftlaget | Kraftlaget | 2006 | 2 | |
| Kreukniet, Bigot, Poolman en Blaaser | Kreukniet, Bigot, Poolman en Blaaser | 1890 | 3 | |
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