| Acronym | Definition |
|---|
| JK | Just Kidding |
| JK | Joke |
| JK | Joking |
| JK | Jedi Knight (Star Wars) |
| JK | Jamie Kennedy (comedy TV show) |
| JK | Junior Kindergarten |
| JK | Jammu and Kashmir (state in India) |
| JK | John Kerry |
| JK | John Krasinski (actor) |
| JK | Jusuf Kalla (Indonesian politician) |
| JK | Jamiroquai (band) |
| JK | Juscelino Kubitschek (Brazilian ex-president) |
| JK | John Kennedy |
| JK | Joanne Kathleen (Rowling, Harry Potter author) |
| JK | Jason Kidd (basketball player) |
| JK | Jackknife (stretching exercise) |
| JK | Jyoshi Kousei (female high school student; Japan) |
| JK | Jin Kazama (Tekken 3 character) |
| JK | Jack Kilby (TI engineer; inventor of the integrated circuit) |
| JK | Järnkaminerna (Djurgårdens IF supporters) |
| JK | Järnkaminerna (Swedish sports fans) |
| JK | Juuni Kokki (Anime) |
| JK | Kidd blood group system |
| JK | Jälkikirjoitus (Finnish: Post Scriptum) |
| JK | Jääkärikomppania |
| JK | Jiddu Krishnamurthy (philosper) |
| JK | Jedrilièarski Klub (Croatian: Yacht Club) |
| JK | Jumping Kangaroo |
| JK | Julianischer Kalender (Julian Calendar) |
| JK | type of flip flop named for Jack Kilby |