Kainophobia or Kainolophobia - Fear of newness, novelty, anything new, change, innovations, unfamiliar things. (Cainophobia, Cainotophobia, Neophobia)
Kakorraphiaphobia or Kakorraphiophobia or Kakorrhaphiophobia – Fear of failure, defeat or looking bad. (Atychiphobia)
Katagelophobia - Fear of ridicule, being put down or embarrassed.
Kathisophobia - Fear of sitting or sitting down. (Cathisophobia, Thaasophobia, Thassophobia)
Kenophobia - Fear of voids, empty rooms, barren spaces. (Cenophobia, Cenotophobia)
Keraunophobia or Ceraunophobia - Fear of thunder and lightning. (Astraphobia, Astrapophobia)
Kinesophobia or Kinetophobia or Kinetoptophobia – Fear of movement or motion.
Kleptophobia - Fear of stealing. (Cleptophobia)
Koimetrophobia - Fear of cemeteries. (Coimetrophobia, Necrophobia, Placophobia, Taphephobia, Taphiphobia, Taphophobia)
Koinoniphobia - Fear of rooms full of people.
Kolpophobia - Fear of genitals, particularly female.
Koniophobia or Koniphobia - Fear of dust. (Amathophobia)
Kopophobia– Fear of fatigue or exhaustion. (Copophobia, Ponophobia)
Koprophobia - Fear of feces, excrement, or defecation. (Coprophobia, Scatophobia)
Kosmikophobia - Fear of cosmic phenomenon.
Kymophobia - Fear of sea swells, waves or wave like motions. (Cymophobia)
Kynophobia - Fear of dogs or rabies. (Cynophobia, Lyssophobia, Hydrophobia, Hydrophobophobia)
Kyphophobia - Fear of stooping.