| Kajaanin kaupunginteatteri | Kajaanin kaupunginteatteri | Finland, Kajaani, Kauppakatu 14 | 1976-09-16 | 2010-05-20 | 1976–2009 | 2 | |
| Kurtheater Bad Homburg | Kurtheater Bad Homburg | Germany, Bad Homburg vor der Höhe, Louisenstraße 58 | 2017-02-02 | 2023-06-20 | 2017–2023 | 2 | |
| Kyrkholmen | Kyrkholmen, Skellefteå | Sweden, Kyrkholmen, Skellefteå, Kyrkholmen | 1997-06-18 | 1997-07-13 | 1997 | 1 | |
| Kulturhuset Blå Grotte | Kulturhuset Blå Grotte | Norway, Fredrikstad | 2009-09-30 | -- | 2009–2022 | 5 | |
| Koszalin | Koszalin | Poland, Koszalin | -- | -- | | | |
| Koninklijke Nederlandse Schouwburg | Koninklijke Nederlandse Schouwburg | Belgium, Antwerpen | 1918-01-19 | 1992-03-29 | 1918–1992 | 7 | |
| Kvitsund Gymnas | Kvitsund Gymnas | Norway, Kviteseid, Jacob Naadlands Veg 2 | 2012-11-30 | 2012-12-01 | 2012 | 1 | |
| Kvinesdal | Kvinesdal | Norway, Kvinesdal | 1991-09-26 | -- | 1991–2005 | 3 | |
| Königliches Theater Cassel | Königliches Theater Cassel | Germany, Kassel | 1878-08-24 | -- | 1878–1889 | 2 | |
| Komaba Agora Theater | ΑΓΟPA (Komaba Agora Theater) (Komaba Agora Theater) | Japan, Meguro-ku, Komaba 1-11-13, Yubinbango | -- | -- | | | |
| Kleines Theater | Kleines Theater | Germany, Landshut, Bauhofstraße 1 | 2006-02-10 | 2011-04-30 | 2006–2011 | 3 | |
| Kongshaug musikkgymnas | Kongshaug musikkgymnas | Norway, Lepsøy, Os | 2006-03-25 | 2006-03-28 | 2006 | 1 | |
| Kecskemét | Kecskemét | Hungary, Kecskemét | 1909-03-06 | -- | 1909–2007 | 14 | |
| Kongreßhaus Villach | Kongreßhaus Villach | Austria, Villach, Europaplatz 1 | 2001-04-02 | -- | 2001 | 1 | |
| Kulturni centar Novog Sada | Kulturni centar Novog Sada (Cultural Center of Novi Sad) | Serbia, Novi Sad, Katolička porta 5 | 2011-11-07 | 2012-02-15 | 2011 | 1 | |
| Kutaisi | Kutaisi | Georgia, Kutaisi | 1898-02-20 | -- | 1898 | 1 | |
| Kongress-Saal AVALON Hotelpark Königshof | Kongress-Saal AVALON Hotelpark Königshof | Germany, Königslutter, Braunschweiger Str. 21A | 2007-02-18 | -- | 2007 | 1 | |
| Koninklijke Nederlandse Schouwburg | Koninklijke Nederlandse Schouwburg | Belgium, Gent, Sint-Baafsplein Square | 1956-12-11 | 1996-10-26 | 1956–1996 | 3 | |
| Knox Memorial Theater | Knox Memorial Theater | United States of America, Mt Vernon, 112 E High St | 2024-04-06 | 2024-04-06 | 2024 | 1 | |
| Kiruna | Kiruna | Sweden, Kiruna | 1991-04-16 | 1991-04-16 | 1991 | 1 | |
| Kammerspiele Wien | Kammerspiele Wien | Austria, Wien | 1927-03-17 | -- | 1927 | 1 | |
| Kurtheater, Norderney | Kurtheater, Norderney | Germany, Norderney | 2010-03-09 | -- | 2010 | 1 | |
| Kapitelberget | Kapitelberget | Norway, Skien, Christian Magnus Falsens gate | 1983-05-30 | 1983-06-12 | 1983 | 2 | |
| Kulturbygget | Kulturbygget | Norway, Raufoss | 1981-11-05 | -- | 1981–1989 | 2 | |
| Kulturhaus Gotha | Kulturhaus Gotha | Germany, Gotha, Ekhofplatz 3, | 1993-06-11 | 1997-10-12 | 1993–1997 | 2 | |
| Kulturzentrum Saalbau | Kulturzentrum Saalbau | Germany, Homburg, Zweibrücker Straße 22 | 2018-03-15 | -- | 2018 | 1 | |
| Kampnagel | Kampnagel | Germany, Hamburg, Jarrestraße 20 | 1997-09-19 | 2014-01-12 | 1997–2014 | 2 | |
| Kjevik | Kjevik | Norway, Kjevik | 1971-02-26 | 1971-02-27 | 1971 | 2 | |
| Künstlerhaus Mousonturm | Künstlerhaus Mousonturm | Germany, Frankfurt am Main, Waldschmidtstraße 4 | 2000-12-16 | 2015-01-29 | 2000–2015 | 2 | |
| Kvaløya videregående skole | Kvaløya videregående skole | Norway, Kvaløysletta, Nedre Storvollen 75 | 1997-11-12 | -- | 1997 | 1 | |
| Kamara Színház | Kamara Színház | Hungary, Szombathely | 1924-07-10 | -- | 1924 | 1 | |
| Klagenfurt | Klagenfurt | Austria, Klagenfurt | -- | -- | | | |
| Kulturhuset Milepelen | Kulturhuset Milepelen | Norway, Sagstua, Herredsveien 2 | 1989-09-17 | 2015-09-30 | 1989–2015 | 3 | |
| Kurtheater | Kurtheater | Germany, Bad Kissingen, Theaterplatz | 1997-10-26 | 1997-10-26 | 1997–2018 | 5 | |
| Kulturzentrum | Kulturzentrum | Germany, Weißenburg, Luitpoldstraße 9 | 2004-03-20 | -- | 2004 | 1 | |
| Kemerovski teatr drami imeni A. Lunačarskogo | Kemerovski teatr drami imeni A. Lunačarskogo | Russia, Kemerovo, Vesennyaya Ulitsa, 11 | 1979-01- | -- | 1979 | 1 | |
| Kunstencentrum De Vlasbloem | Kunstencentrum De Vlasbloem | Belgium, Nieuwkerken-Waas, Gyselstraat 9 | 2007-03-10 | 2007-03-31 | 2007 | 1 | |
| Kamuzu College of Nursing | Kamuzu College of Nursing | Malawi, Lilongwe | 2006-05-26 | -- | 2006 | 1 | |
| Königliches Theater Helgoland (Hoftheater-Ensemble) | Königliches Theater Helgoland (Hoftheater-Ensemble) | Germany, Helgoland | 1878-04-14 | -- | 1878 | 1 | |
| Krajské krušnohorské divadlo Teplice | Krajské krušnohorské divadlo Teplice | Czech Republic, Teplice | 1958-02-23 | -- | 1958 | 1 | |
| Kratikó Théatro Voreíou Elládos, To | To Kratikó Théatro Voreíou Elládos (National Theatre of Northern Greece) | Greece, Thessaloniki, Ethnikis Amynas str 2 | 2020-02-15 | 2020-05-17 | 2020 | 1 | |
| Katholisches Pfarreizentrum Heilig Geist | Katholisches Pfarreizentrum Heilig Geist | Switzerland, Wetzikon, Langfurrenstrasse 10 | 2010-05-16 | -- | 2010 | 1 | |
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