| Term | Kanji | Description |
| Kaeru Geri | 変える蹴り | Switch kick or change kick. Straight leg change kick |
| Kagami Biraki | 鏡開き | Opening the Mirror, typically on 11 January each year. |
| Kagamu Dachi | 屈む立ち | Squatting Stance |
| Kagi Tsuki | 鉤突き | Hook Punch |
| Kaiso | 開祖 | Founder of a martial arts style |
| Kaiten Ushiro Geri | 回転後ろ蹴り | Spinning Back Kick |
| Kake Uke | 掛受け | Hooking/Hanging Block |
| Kakiwake Uke | 掻き分け受け | Reverse Wedge block (both arms) |
| Kakucho Dachi | 拡張立ち | Extended Stance |
| Kakuha | 鶴破 | Kata: Breaking Crane. Created by Toguchi Seikichi |
| Kakuto Geri | 踵蹴り | Heel Kick (Mule Kick) |
| Kama | 鎌 | Kama or Nicho Kama (二丁鎌) - Handheld Sickles |
| Kamae | 構え | Postures. Set postures or starting points |
| Kampai | 乾杯 | Cheers, literally "empty the cup/glass" |
| Kanabo | 金棒 | A Japanese two-handed spiked war club |
| Kanejo | 鐘杖 | A staff longer than 1 meter with flaired out ends. Ryukyu Jo |
| Karamidi | 絡み手 | An old form of full body entanglement techniques |
| Karate Do | 空手道 | Empty Hand Way - Modern expression of Okinawan Te |
| Karii | 嘉例 | Cheers / Good health / Kampai (Uchinaguchi) |
| Kata | 型 | Forms/Patterns. Composed of 形 pattern, カ to cut, 土 ground |
| Kawasu Uke | 交す受け | Parry Block - Open Hand Parry Block |
| Keage | 蹴上げ | Kick up - Snapping kick - Angular kick - knee to target |
| Keiko | 稽古 | Practice/Training |
| Kekomi | 蹴込み | Kicking - Thrusting - Non angular/direct kick |
| Kiba Dachi | 騎馬立ち | Horse Riding Stance (Cavalry Stance) |
| Kidokan | 鬼道館 | School of the Demon's Way - Opened in 1950 by Kojo Kafu |
| Kihon Undo | 基本運動 | Exercise consisting of basic techniques |
| Kijimuna | キジムナー | Elflike creatures that live in Banyan trees, Okinawa Yokai |
| Kinjo Sanda | 金城真三良 | Kobudo Pioneer - Ufuchiku (1834-1916) |
| Kinkobo | 金箍棒 | Staff with both ends covered in gold or a golden color metal |
| Kintsugi | 金継ぎ | Join with gold. To fix something broken with gold. |
| Kiso Kumite | 基礎組手 | Foundational kumite based on movements from kata |
| Kitae | 鍛え | Training/Forging |
| Kobayashi ryu | 小林流 | Small Forest (Kobayashi) style -Found by Chibana Choshin in 1920 |
| Kobudo | 古武道 | Old War Way - Somewhat regional term |
| Kocho Geri | 蝴蝶蹴り | Butterfly Kick |
| Kocho Soto | 蝴蝶雙刀 | Butterfly Swords - Chinese short swords - Ch. Bart Cham Dao |
| Kojo Chinpe | 湖城珍部 | 1st Generation head of Kojoryu, Cai Shichang 蔡世昌 (1780-1865) |
| Kojo Choko | 湖城張喬 | Founder of Kojoryu, Cai Zhaogong 蔡肇功 (1656–1737) |
| Kojo Isei | 湖城以正 | 3rd Generation head of Kojoryu (1832-1891) |
| Kojo Kafu | 湖城嘉富 | 6th Generation head of Kojuryu (1909-1996) |
| Kojo Kaho | 湖城嘉宝 | 4th Generation head of Kojoryu (1849-1925) |
| Kojo Shigeru | 湖城繁 | 7th Generation head of Kojoryu (1934-1970) |
| Kojo Shoi | 湖城精仁 | 2nd Generation head of Kojoryu, Cai Changwei 蔡昌偉 (1816-1906) |
| Kojo Shuren | 湖城秀蓮 | 5th Generation head of Kojuryu (1883-1945) |
| Kojo Tatei | 湖城大禎 | Early Karate pioneer, aka Goken Tanme (1838-1917) |
| Kojoryu | 湖城流 | Style of the Kojo/Cai (湖城/蔡) family. Established 1950 by Kojo Kafu |
| Komeikan | 講明館 | School of Pure Teaching - Founded in 1955 by Miyagi Kei |
| Kongoken | 金鋼圈 | Steel Oval |
| Kosa Dachi | 交叉立ち | Crossed Stance |
| Koseki Tohon | 戸籍謄本 | Japanese family registry, records births, deaths, marriages, heirs |
| Koshi Gamae | 腰構え | Hip posture – Hanmi (半身), Zenpo (前方) |
| Kudokan | 求道館 | School of Seeking the Way - Founded by Nakazato Joen in 1954 |
| Kuho | 九歩 | Kata: Nine Steps |
| Kukan | 空巻 | Kata: Sky Scroll (Kojoryu) Ch. Kōngjuàn |
| Kumisukuchin | くみすくちん | A type of Okinawan tea |
| Kun | 棍 | Semi-flexible staff roughly 6 ft in length, polearm shaft |
| Kuniyoshi Shinkichi | 国吉真吉 | Early Naha Te pioneer, Saijutsu/Bojutsu master (1848-1926) |
| Kunren | 訓練 | Training Drills/Exercises |
| Kurumanbo | 車棒 | Two section staff, one end is typically shorter |
| Kururunfa | 久留頓破 | Kata: Hold Long and Sudden Strike. Spinning Dragon Method (繰龍法) |
| Kusanku | 公相君 | Kata: Mr. Government Official. Original name Ufukun (大公) |
| Kusarifundo | 鎖分銅 | A chain with weights on both ends, aka manrikigusari (万力鎖) |
| Kusarigama | 鎖鎌 | Chain Sickle - Single Kama attached to chain/rope |
| Kushinryu | 空真流 | Established in Osaka in 1937 by Ueshima Sannosuke and Kinjo Kensei |
| Kuwa | 鍬 | A short handled garden hoe. Sounds like gwa |
| Kyan Chotoku | 喜屋武朝徳 | Famous karate teacher and pioneer of Tomari Te (1870-1945) |
| Kyoda Juhatsu | 許田重発 | Naha-te pioneer, founder of Toonryu 東恩流 (1887-1968) |
